On my 8 strand 450+ I like to pad with 4 strands of B50 per bundle,I like to serve it with BCY .025 braided.It gives me the nock fit I like,for X-nocks and Easton 3D Super nocks.I sometimes pad with the same material,but like to use B50 to pad with.Been using B50 to pad FF type strings for years.I make my 8 strand 450+ for bows 65# and heavier.A 6 strand 450+ I serve first with BCY 1D .017 and then double serve with BCY .021 braided just long enough for my fingers and nock.This combo gives me a great nock fit too.