I fletched two arrows with 4 vanes. The Blitzenburger jig had the presets for both 90 degree and 70x105 degree, so I did both just out of curiosity. Honestly, neither flew any better than the three vane arrows. Since flight didn't improve, I stripped them and refletched with three. No sense, IMO, adding the extra weight and dragin the back end if it's not helping. They sure do look great with four vanes, though.