RE: blazers
A helical clamp should make things much easier for you. Fletching offset with a straight clamp is one thing, but you're trying to use a straight edge (straight clamp) to glue to a curved surface (helical).
I use the Bitzenburger jig, helical clamp and Goat Tuff forfletchingBlazers on mydaughter's youth arrows, and I don't have trouble setting it up.
I will say one thing about Goat Tuff, though... I don't use it to glue directly to the shafts any longer. I only use it to glue to wraps. It's great stuff, it sets fast and holds well, but when it's time to re-fletch, I've boogered quite a few carbon shafts trying to get that stuff off... even with a Zip Strip. Bohning Fletch Tite Platinum takes longer to set.... especially with feathers... but it strips off a lot easier when the time comes.