Does anyone know how to make the CC on a 04 MCS more responsive, or able to maintain speeds better?

Currently I see fluctuations between 2 to 5 mph on relatively flat freeways, on long trips over larger hills the delta is much greater.

Update: So I did an “ECU reset” (controversy on what is actually reset, see here: https://www.northamericanmotoring.co...ni-viagra.html – now the CC works much better, still slight fluctuations in speed on inclines and declines on a relatively flat freeway, but hardly noticeable and very much livable, will not be able to check it on a long run for a couple of more weeks, otherwise I think it fixed, or it has greatly improved.