I was wondering if you guys had any idea what I'm doing wrong...

I've had a Jo-Jan Multi Fletcher with right helical clamps for about a year now. I've tried to fletch arrows with it 4 or five times and have never had it come out right. Everytime I do a batch it seems that I can never get the vane to sit flat on the arrow. I would assume that its an adjustment problem but I just can't seem to get the jig into a position that allows for 100% fletching contact with the arrow. On every batch I seem to have the problem where either the front, middle, or end of the vane isn't properly adherd to the arrow; it varies depending on where I have set those bars.

Any ideas, or has anyone else seem to have this problem, because this jig is about 2 seconds away from being ebay'd.

I forgot to ask, where on the clamp do you guys normally position the vane? I have been sticking it in the clamp and lining it up with the very end edge of the clamp.