I was thinking about the leaning forward and it depends on HOW you're doing it whether or not it's a bad thing and your discipline. For instance, I've ridden all my life, Hunt Seat. Now I'm switching over to Western Pleasure or Stock Seat. I have a tendency to want to roll forward into a more forward seat which is incorrect for WP but not a bad thing in Hunter classes. If you are closing your hip angle and falling forward at the waist, that's a different issue and one that loads of practice will help, just like the chair seat thing. Once you're more secure in the saddle, I'd expect both things to improve somewhat if not be totally erradicated.