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You are a bit over spined. Optimal spine for your current setup is about .360"~.370". If you want to experiment and fine tune the arrow spine , try some heavier field points to see if the group size improves. http://www.3riversarchery.com/Screw-In+Field+Point+Test+Kit+5%2F16_iCF5-T_baseitem.html
Your setup is on the borderline between .400 spine and .340 spine. At 25.75" finished length, the .400 spine shafts would be weak, even with 100-gr points, and the .340 are stiff. A 27.5" Beman ICS 340 shaft with 125-gr points would be correctly spined for your bow setup and only result in 3 fps slower arrow speed. In the future, cutting shafts no shorter than 27" would be preferable for the bit of forgiveness gained versus the few fps speed lost. However, a stiff shaft isn't that critical to accuracy IF shooting form is consistent
bow is tuned for level nock travel. Top Pros often shoot overly stiff, fat shafts for a scoring advantage, and trust to consistent shot execution. As mentioned, because a stiff shaft bends less than a weak one, broadhead aerodynamics have less influence on them, hence tune easier and because they flex less on impact they penetrate better than a weak shaft. ... hope this helps.
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