tldr: Car drove beautifully before lift kit, then had 10-25mph acceleration vibration

Hi guys, a lot of words here, trying not to leave any details out.

Intro: My 2019 Countryman S All4 Automatic with electronic suspension (29,000 miles on it, purchased at 22k miles late last year). The car received a 2 inch lift kit. I opted for the journeys kit over the m7 2.5" kit as I did read only a couple instances of cv axle vibration concerns after install, this issue also seemed to narrow down only to the manual models anyhow. The car was driving beautifully before the job aside for strut top hat bearing creaking noises when turning the steering wheel. I DIY installed this kit as I really don't have any shops I can trust near me, dealer costs are crazy and the dealer is over 2 hours drive away to even bother with that noise. I have a general knowledge of this stuff, been DIY wrenching my own other Japanese car projects quite successfully.

Install seemed to go okay. I did remove the front CV axle bolts in order to remove the whole knuckle and strut. I installed the new strut mounts (ecs part number 4629187) using a spring compressor, popping off the shock nut, swapping and lining up new strut bearings, torquing the shock nut back down. Easy peezy. I plopped on the strut spacers and bolted the shock tower and knuckle back onto the car. Did the other side the same. I torqued down the cv axles, lower control arm pivot bolt, tie rod ball nut, and lower control arm ball joint bolt, and put on new included sway bar links on both sides and carried onto the back side. Back side went just fine; I did have to get a touch creative with the shocks' wiring management caps as the journeys lift didn't accommodate for the electronic suspension. No big deal.

First test drive: felt pretty good and hooray! New strut bearings resulted in silent and smooth steering. I was light and careful on the throttle feeling and listening for anything binding and screwy. Seemed okay. Went on a normal test drive with normal light driving throttle and immediately noticed a bit of wobble/vibration felt in the whole car. Feels a bit side-to-side and the oscillation is substantially faster than wheel rotation speed so, I didn't want to blame wheel issues. The vibration happens in a straight line, seems to be slightly worse in a slight-turn, back to being not as bad when turning tightly. The issue seems to vanish after 30mph (most of the time). This feels like dreaded CV axle binding (inner joint, likely).

Further diagnosing: If I am very light on the throttle, and I mean very light, it seems I can accelerate slowly without the issue showing up at all. The moment I touch the throttle, the shake is present and more pronounced upon more throttle applied. This shake produces zero noise, nothing I can hear with the windows down or up. Highway speed: nothing. Zero vibrations on deceleration whether light or hard on the brakes and I cannot seem to feel it when engine braking, even when engine braking aggressively with downshifts. When really stressing the car, side to side slalom swaying, no clunks or play to point towards control arm bushing failure, etc. Pulling and pushing real hard at 9 & 3, 12 & 6 with the front tires jacked off the ground, notta, zero play.

I gave everything a really close look-over, I couldn't find any issues. Two days later, my new cv axle bolts arrived (as I found out later that they are tty bolts and should absolutely be replaced), I swapped them out, torqued to yield. Went for another spin to see if this would resolve the issue. Nope, exact same results. Interestingly, the newer cv axle bolts (part # 31206795249) are a bit longer than the ones that my car has installed bit seemed to clear perfectly fine inside the axle shaft.

What could I have broken? I ask this because during the disassembly process of the initial install, there's a CHANCE that I broke the CV axle bolt loose without a screw-driver jamming the brake rotor in a locked position. I had no helper with me to hold the brake pedal down. Car was in park, rear parking brake applied, and only one tire was lifted off of the ground. After removing the cv axle bolt, I realized my screw driver was plopped on the ground. No idea if it was in place while breaking that bolt loose or not. I would imagine these CV axles are capable of some pretty intense torque as 1st gear in any car should be quite the multiplication of the engine's rated torque output, no? I would really hope that doing something like that didn't damage a cv axle.

Could it be motor mounts? I read that the F series cars have very quickly wearing/sagging top motor mounts. I took a good look at mine and it does appear that the main rubber component does sag below the left-side rubber component indicating it is in fact sagging. I had a hunch that I had a saggy engine mount as I could feel occasional shift-shock going through the gears. In my mind, I imagine that if my cv axles are now sitting at a new position with the 2" lift installed PLUS a crooked sitting engine, the cv axles are going to likely be on an excess bind, yeah? Maybe?

I have talked to three people now that have this same 2" journeys lift kit plus another with the 2.5" M7 lift kit, all of them claim there are zero cv axle vibrations and concerns what so ever. They all had their kits installed with even more miles on the clock than I had. Some claim that CV axles wear into their normal set position and when the cv angle is changed (lift or lowered), the cv axles have a vibration due to their pre-worn in position fighting with the new position and some continue to claim that they will wear into their new angle. It's been roughly 500 miles of driving hoping this vibration would subside but it seems to still be quite obvious.

Strange observation: There's been times where it seems the issue is suddenly GONE. Like, I mean- absolutely gone. I can be driving straight down a road at 10mph, rhomp on the throttle and NOTHING, silky smooth. Here's the catch: the issue comes right back after my next 90 degree turn (rotating the wheels&cvs different speed and into a different sync with one another) It's almost as if the left and right side CV axles are canceling the issue out of one another. I can replicate this by making a U turn, straighten out, try again, issue vanishes, make another u turn, straighten out, issue is back. It seems I can make just the right amount of turn, I can put the issue in its "worst" position and feel the vibration on from 10-36mph or so, keep on driving, go around a turn or bend in the road and it diminishes or vanishes until the next turn.

Thank you for reading.

Thoughts?