When fletching the Blazer vanes, add a little glue to the front tipand the rear of the vane. This should help with the durability of the vane as well.

Yep, mobo is right, the helical will still improve flight, even though it is only a 2" vane.

An offset will work as well, but really, you might see some improvement with a helical clamp.

I currently am using the Bitz with a straight clamp (as that is all I have). . .I would try helical if I had the clamp.