Boris, you may have the arms too close together. You want the arms to contact the arrow about 1/3 of the way up the shaft. You'll probably need to make other adjustments to the rest. Since the arrow is lighter you can lower the rest tension. Do your new arrows have helical vanes? If so, and your old arrows didn't, that'll present some tuning issues (rest clearance). I like the carbon arrows, and feel they're worth getting set up right.

Phil.