Don't take specs on nock or brace height dimensions as gospel. Even traditional bows need to be "tuned". I shoot 3 fingers under and my nock height is about 1/2 inch. To me it sounds like a nock height problem. Try raising the nock about a `1/16" at a time. Have someone watch your arrow flight from behind you. It's easier for that person to see problems with arrow flight than the shooter. Dick