I had the same problem with my guardian. You dont have to buy a new rest it has to do with the cables being to close. Just change your fletching. i use low profile vanes and that solved the problem. i started with blazers but they didnt give me clearance, then went to feathers. Solved the problem becuase they just lay down with any contact, but wasnt perfect. I wanted more clearance. I was sponsered by victory in 08 and when i switched my arrows. They came pre fletched with 4" standard vanes and they gave me the most clearance yet , so i am sticking with em. This made me realize all i had to do is change my fletching. try quickspin 2" or 3.125". they work just as good.
I tried the saunders slide and gave me serious cam lean. I tried three different slides the only one that works is Hoyt standard cable slide or the origianl BT one.
but try changing your fletching first, than go from there. good luck. it can be discouraging, but stick with the bow these bow shoots amazing once this little glich gets fixed.
what fletches do you have now?