I've tried quite a few different types on my 05'Allegiance, and some worked better than others.
But---I would say the best I've used so far, and it has only been on my bow now for the last three or so weeks is the
Winners Choice Weather Tamer.
It's pricy compared to the average $9-$12 cable guard--but you get what you pay for.
http://www.cabelas.com/cabelas/en/te...&noImage=0
It's smooth, quiet, has more cable clearance and looks like it has reduced the limb torque a bit. All in all, your groups should improve. IMHO.