I ALWAYS shot straight fletched feathers, 4 inch. Tuning broadheads was always an all day deal. I'd mix and match broadheads, swap 'em, shoot everything at 20, 30, 40 and beyond. Cull, sort, try other combos to get the best fliers I could for hunting. From a dozen NEW arrows I usually expected to get anywhere from 5-7 or maybe 8 that passed the test. The others became practice arrows. Last year I went to the very slightest of helical. Now I screw on a broadhead and expect it to shoot where I aim. I may have 1 or 2 rejects from a dozen...probably caused by a misaligned insert or something. The little bit of helical was all that was needed to truly stabilize the arrow. Say it slows the arrow a little(which is probably VERY little) What speed you loose from the helical is probably mostly gained back from having an arrow that corrects its flight quicker and is more stable. With field points you might not see the difference but when you screw on a fixed broadhead things have to be right. You still have to make sure the bow is super tuned... but you should do that anyway...regardless of what you put on the arrow.