Maybe I mis-understood your original post, but if you're simply asking if you must shoot left helical because you're left handed, the answer is no, it doesn't matter. Just remember, if you're shooting feathers, they must ALL be the same type of feather (left or right wing). With vanes, it doesn't matter, as they are all the same.
I know many archers that shoot helical with good results, especially when using fall-awy rests. Slight off-set also works but it is not as stable when shooting some broadheads, IMO. Hope it helps.
BOHNTR )))---------->