If it is a zebra twist string, sometimes the shop will just fire in a bunch of twists, and sell the bow, you need the right number of twists, or the string will not be stable, if you have access to a press, try putting some in and taking them out while looking at how much it twists up. I use the Tru nock, but I don't like to have to offset it to get the right peep rotation, sometimes it is a really large amount like 90 deg.+ and that isn't going to be neutral on arrow flight. The only real problem is that to work on this issue you need to have access to a press, or something simillar.