My bro in law bought a new drenaline and I'm trying to paper tune it(i have paper tuned hundreds of times)and I can't get this on right.I have tried 27 1/2 inch 2315 xx78's and 26 1/2 inch of the same and the same length 2314 xx78's and 2217's am I using the incorrect spine here,and if I am could someone tell me what to use please? P.S. he wont shoot carbon so that's out of the question thanks. Drizzu 29 inch draw length at 70#