After my prep, I'm not sure I could be 100% certain that the hairs actually feel softer to the touch - I just know they must be. So I wouldn't worry too much about that if you're showering etc.

Also, it's quite difficult to do ATG on the chin, to keep the angle constant around convex and concave curves is difficult, and it's not made any easy by the fact that the skin on your chin is difficult to get really taut.

I would just keep plugging away, you will start to notice improvements, don't be afraid to try different grips or angles of attack either - it will all help you decide what works for you and what doesn't.