Thinking about it, the linear force curve in the Xbox One's triggers places a greater emphasis on muscle memory than the irregular one in the DualShock 4's L2 and R2 buttons. I generally find it a bit difficult to adapt to such a similar, but different experience. The position and shape of the sticks hasn't really done much for me either.
But in the game itself, the way Forza handles steering inputs doesn't really agree with me as far as precision goes.
On the wheel, I find that in some cases the brakes are really hard to get a knack for after spending so long in more focussed sims. I get to any given braking point and slow it down where I think I should be doing - but then I feel like I've hit the brakes too soon, so I ease up a bit, only to be caught out by the gravel trap. If I don't ease up, however, I just arrive at the corner at too low a speed to enter it properly. Clearly speed does affect braking distance, but the relationship between the two factors is a bit weird to me in this case.
With the force feedback, I'm a bit thrown off by the slightly random impulses that don't seem to correspond with what the car is doing in addition to the lack of weight coming in when I'm at what should be the optimum steering angle. Tying it in with the downforce confusion, it makes it feel like turning the wheel just redirects the front end around a given radius, rather than directly interacting with the front wheels and the road. If I were to put words to it, 'floaty', 'indirect' and 'light' come to mind. It makes it really hard for me to notice and correct losses of grip.