Broadhead tuning issues

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I shoot a Mathews ZXT pulling 71 lbs at 28" and I am having some trouble with broadhead flight. I had my local archery shop paper tune my bow when I put a QAD dropaway on and its shooting bullet holes but when I put my 4 blade 100gr muzzy's on the arrows are wanting to go about 8" right of field points at 20 yards. If I try to move the broadhead impact to the fieldpoints the difference is the same it just moves both groups. Could it be a weak spine? I am shooting Carbon express piledriver 350 and DCA hunters with 340 spine.
 
It could be spine....you're a little on the weak side, it could also be a "wobbly" shaft or insert/shaft not square as well. Spin the arrows and see if you can pick out a "bad" one. Try backing the poundage down two turns and see what that does.

However, it could be many other things as well. Any individual/or combo of Cam timing, Idler lean, centershot or rest timing could cause it as well. Do you know how to check any of those?
 
Bullet holes through paper have to be consistent at different distances. A bullet hole at one distance does not indicate a good tune. If you get a bullet hole at 6, 12 and 24 ft you have good flight. Ive seen first hand a bullet hole at 12 ft that is a left tear at 6 ft and a right tear at 24 ft....fishtailing arrow flight.

8" right at 20 yards from field point POI means something ain't right. As TNDeer Guy says check arrow spine and spin test your arrows.

I shoot bare shafts. If you can get a arrow with no fletching to hit with fletched arrows at 20 yards, you can screw on any broadhead (that spins true) and it will be very close. Take an arrow with no fletching and start close...10 yards and see how it groups with fletched arrows.
 
I had the same problem with my new bow off the shelf. UTGrad is correct. First make sure you buy arrows with the correct spine for your draw weight. Cut the fletching off one arrow from the group of arrows that you are going to hunt with. Insert a field point, not a broadhead, and shoot the arrow from about five yards out. Adjust the rest and nock point until the arrow hits the target straight on. Then move out until you get to about 15 or 20 yards and fine tune even more. If you can get the bare shafted arrow to land straight on, you are ready for broadheads.
 
71# at 28" with anything less than a 400 shaft, would seem to be lacking a tad in the spine department, to me.
 
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