Mostly FM2 just needed the correct Inertial values put in, along with the correct weights and engine horsepower. Once I got those numbers in it started to behave a lot better.
I noticed a problem in the Mi-24 Hind, though. It doesn't have the correct vertical restorative force in there, it hangs and doesn't want to come back to vertical if you center the cyclic. I need to look into that. Hopefully it's just something simple like a setting that's missing.