If vane or feather clearance is not a problem, then helical fletch should help open blade broadheads shoot more consistently. I have had some setups that shot well with just offset, most often with a shoot-through rest that wouldn' t allow good clearance with helical fletch. Many guys claim to be able to tune well enough that it doesn' t matter. IMO, if you have no clearance issues, then helical can' t be a bad thing. I just got a left helical clamp for my Bitzenburger jig, and some AAE Speedflyte vanes. I am currently pleased with my broadhead accuracy, but it will be interesting to see if there is any improvement, especially with my backup bows.