Brandon Pattison
WKR
IMO, ALWAYS use helical, even for super short target vanes. I have used 4", 90 degree fletch for traditional setups and loved not having to look down. If you are using 4-fletch on Blazers you run into the rest, rest-depending. However, the smaller the OD on the shaft the better. You should get adequate steering for broadheads with 3 if your bow and arrows are properly tuned.