Having the same issue. I had it sort of fixed by setting damping rate to around 10.0. but it may generate other side effects. I’m wondering if you had found out other better fixes, or figured out what actually caused that weird behavior?
I also have some issue finding a proper friction value for the tire. If I set it too high the tank can’t turn in place but if I set it lower then it drifts too much when turn in high speed. Just couldn’t find a sweet spot where it works in both situations.