Youd be surprised how far back you acctualy should stay. If your infront or ontop of the pommel your in trouble!
Your lower body should only go a litle further forward, its more huvering over the area where you would normaly sit to take your weight off the horse. While in the 2 point you should feel like if your horse were to buck or run out etc. you can be in sitting position instantly. Don't go into the land of no return!
Otherwise your doing great!