I use right no matter what, even with traditional bows the direction isn't important. What is important is that they are all the same! guys used to sya put left on tradtional to help the arrow get away form the bow shelf. Watch slow motion movies of a traditinal bow shooting helical, you will see the arrows can not generate enough rotation to stabilize the arrow let alone pull it away form the riser in that short distance! Helical stabilizes the arrow by roating it like a football or baseball when it spins. Helical fletch will not cause the arrow go of course from a straight line so the theory of "pulling the arrow away form the bow" is invalid. If it did you would see compound shooters with their sight pins going further & further in one direction as the range inscrease & this does not happen.

I use right because I have right hand clamps. If you shoot feathers just make sure you use the right feathers (left or right wing) for your clamp. Like I said pick one or the other & always keep them the same.