P,

I am shooting a WB and am using blazers, as long as they're glued straight I think you shouldn't have problems with them coming off.
Even offset shouldn't be causing problems.
I have a set of 6 arrows that have a 2" vane, 3/4" high and they never had to be replaced ( I'm talking more than 500 shots fired )
Just make sure they're shorter and stiffer for your WB.
You could try and read how to fletch the blazers on the Bohning website, that helped me.....

F.