I knew David Quinn pretty well and have a lot of info tuning tips that can help. As stated above, he designed these bows to shoot a Bear weathrest, that puts your arrow dead center! He also put heavy phenolic tips, to keep any unused energy from going back down the limbs. David was a mechanical engineer by trade, got into building bows to make an affordable entry level bows for kids, newbies, that would be competitive. He succeded, at any price. I had 12 of his bows at once, 3 now.They are my go to bows, and his daughter is continuing to make them, with a guy laying up the limbs that David trained. David also used D-97 fast flight strings on all his bows, and I have used that and D-10 for best results, with wool puffs, in a flemish string. His endless loop strings smack the limb quiet a bit. If I can be of any help, pm me.