What Buemaker said is an often forgotten tip to tuning the bow. Written about in the Book Hunting the Hard Way by Howard Hill. The pivot point which is usually the deepest part of the grip is where you want that arc to be highest.
I usually shape mine with a rasp and file, but end up with about 1/4 inch cause I get tired of filing....
If the arc is over the pivot, it sure makes a sweet shooter.
Good Luck