Ok I shoot an 80 pound draw Bowtech Extreme. Got it in the higher poundage for the kinetic energy and speed. When i bought it, the dealer guy told me i needed thicker spined arrows because of the power of my bow. So I use these thick carbons that shoot 25fps slower than the regular carbons i shot out of my mathews legacy. curious to see how the smaller spined arrows shot, i shot them out of my new bow. grouped just as well as the thicker ones at 40 yards. i would rather use the thinner arrows cause they shoot 303 fps while the thicker ones shoot 279, 9 fps slower than when the bow was brand new. im all about speed. my question is, does the thickness of the arrow shaft really make that much of a difference with my draw weight?

thanks,
jeff