I've done some searching, but didn't come up with answers.

My wheel is extremely sensitive when driving in a straight line. I'll be bombing along in third gear and the ever so slightest wiggle and I'm spinning out! I realize only having a 180 degrees turn doesn't help, but it never used to be like this when I first started playing a few years ago, and now that I'm back, it's reallllly bad.

I've calibrated to my hearts content with no luck.

Options > Controls
Select the button "Axes / FF" in the middle
Unlock the axes (button on the right)

Rotate your wheel full left to full right