You definitely do NOT want to put your high back angles fully forward. It *sounds* like it would make your riding better, but honestly it will not improve your riding at all and will only make your calves fatigue unnecessarily. The only people that really crank their high backs forward are advanced half pipe riders. And that is only for the guys riding pipe that has a lot of vert.
Feel free to experiment with a few different high-back angles if you want, but in the end it won't really make much of a difference. You will eventually get used to whatever you set your high-backs at and not even notice you made a change in them.