I used to shoot 65#at 25 quite a bit for my hunting bow,,,if you just shoot that bow exclusively you will develop very good accuracy,, I had a floating anchor but tried to use consistent good form,,, the bow will dictate when to let go( you just cant pull it any more) and you will get a great release,,
when you dont have an anchor,, it is good to put a piece of tape on the arrow so you hit draw the same each time,,