If it's cut WAY past center, you could try building the side plate out a little bit. OR, your arrows could be underspined...Maybe try a lighter tip...
OR...It could just be the bow (probably not what you wanted to hear...). A few years back I had a Palmer Double Carbon that shot GREAT, but I had the same problem. I tried everything I could think of, but still grouped right. The only way I could get it to group with the rest of my bow arsenal was to cant it WAY over, and it didn't fit my shooting style, so sadly, it had to hit the road...
Good Luck!