The classic hanger's pivot point is thicker than AF1's, you will eventually get baseplate warp in the pivot cavity. Same result with an AF1 hanger in a classic baseplate, the extra wiggle room will warp and break the pivot cavity since it's more brittle than the "molecular strength" of the AF1 baseplate. Their geometries are also not the same even though Ace claims it to be, and you'll notice the kingpin clearance is worse when you mix.