what rest are you using?
I'm shooting a trykon with ics 340s. DL = 28" and 70 lbs. I originally had speed hunter fletchings on all arrows, but had to re-fletch a couple (I had blazers on hand, so used them). I don't really see a drop off at longer distances between the two fletchings, but I'm shooting a whisker biscuit and can tell the speed hunters are getting pretty torn up (with not a lot of shots). The blazer fletched arrows I have look fine (have the same number of shots). I've rotated the nocks on the speed hunter arrows, but can't really find a sweet spot.
If you're shooting a drop away or anything that doesn't really have contact issues, I would say the two fletchings are about equivalent. Even with the torn up fletchings on the speed hunters, they group with the blazer arrows. Hope that helps.