The NAP is a excellent rest and I certanly would not change it but like any thing you will have to work the bugs out of it

It could be that the rest needs to be dropped down a tad or the nocking point movedup slightly sounds as if the Nock may be bottoming out on the rest due to the rest being slightly higher than the nock travel or it could be something as simple as a little fletch clearance issues

or it could be that the lift cord may be getting in the way
one thing that I would definately do is to get rid of the lift cable and cable guard mount replace with a standard lift cord AKA string loop material and attatch it to the harness

this normally has solved any issues I have dealt with concerning the rest on customers bows.