RE: Arrow nock/ fletching position
I' m w/Arthur, some bows seem real picky about fletch/nock orientation while others seem to not matter. In theory, w/the right spined arrow the fletchings will never contact the shelf (so the orientation won' t matter), but I' ve found this to be impossible w/some set-ups. Actually it' s usually the quill of the fletching that' s the culprit. Since you have arrows set-up both ways, I' d experiment to see which shoots best.
Vic
BTW, I cut the nocks off wood arrows, so never tried heat on ' em...