JimBow,
This is my second year with my Q2XL. My setup is 30 1/2 in draw length at 67#. My arrow weighs 395 grns and flys 286 fps. I have read all the replys on this topic and I would agree with all that has been said. I would especially think cam timing is suspect. I also switched to rubber string silencers, but once I made that change and tuned it in, it shoots very quietly. One additional thought comment, the zebra twist string has been pretty stable on my bow (peep issues) AFTER about 500 arrows or so.

KEEP THE WIND IN YOUR FACE.... FLETCH