If it offsets 4 inch vanes at 3 degrees, then whatever fletch you put in it should be the same offset. The jig doesn't know how long the vane is, just what offset to use. I think Blazer recommends around a 3 degree offset. What I shoot is Blazers, and Predator vanes, and I doubt I have more than a 3-4 degree offset. They don't appear to spin as much as a longer vane, but I think it's an optical illusion. Pulling broadheads out of a target, they are "screwed in" just like when I shot a 4 inch fletch.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol