D-stock, street tire autocrosser
Last year - new Dunlop Z1s, 19mm swaybar at stiffest setting, 48-50 lbs pressure = not great but pretty good results
This year - same Z1s flipped on the rims and 22mm swaybar at mid setting, started at 48 lbs and dropped to 38 lbs = a fairly loose back end.

I have lowered the pressure in the rear and that has helped some. (I run 41-42 in the front.) I changed the setting on the swaybar to the lightest (still 30% stiffer than the 19mm) and that has also helped to regain control.

Questions:
-As my tires wear, both in tread depth and heat cycles what adjustments could be made to swaybar and tire pressures to compensate?
-When I get new tires, do I adjust the swaybar? Do stickier tires allow for a stiffer sway?
-Can a swaybar be set up with the endlinks in different holes to give more incremental adjustment?
-Anyone running the BFG Rivals? I am running against them on some non-MINIs and they look fantastic. Took a run in them on a Civic SI and could not break them loose at all.

 

sounds like your tires are already toast. I'm on set #2 on the Rivals...I had to go from the middle to the stiffest hole on the H-Sport solid 25mm rear bar. So they grip very well.