i find the wheel support for g27 in this game to be off
usually when you over steer, the force feedback should counter steer the wheel, thats the way it is in other games e.g asseto ,
however it doesn’t happen in forza 7 pc (horizon 3 as well). I find that it is near impossible to maintain drifts because of this, i have tried different settings (both in game and external program) and tunes, nothing seems to work. Its the opposite for other people, their wheel actually counter steer by itself when they drift but they use a different wheel so it seems to be an issue with some specific wheels or pc port for wheel is just bad.
Turn FFB understeer down to 5, and FFB minimum as low as it goes and make sure your FFB scale is set to 100. This should help the wheel self align better when drifting. And use normal steering for drifting not simulation, weight transfers are very sensitive on sim and makes it more difficult than it should be