I've been shooting a Hoyt XT2000 for 3 years now and have had trouble with getting tight arrow groups. I've changed my form over and over without greatly affecting the groupings. I have a Whisker Biscuit rest and am shooting GoldTip Hunter Expedition 5575 arrows with 4 inch, helix'd vanes. My question is: Which would be more helpful in tightening groups, getting a different, fall-away style rest, have the arrows re-fletched with 2-inch blazer style vanes, or, my least favorite alternative, do both?