RE: Nock fit
I wouldn' t try changing the nock fit by sandpapering or hot water (had heard about this once and it was considered better then heating the nock slightly over a flame and pinching) just because I think it would give you inconsistant nock fit, you will have some variation. I make my own and like BCY #62 braid in .021. This seems to give me the fit I like using any size nock.