Carphunter when creep tuning you dont want to pull real hard against the wall as this will affect your impact point as well, you just want to make sure your on the wall. After shooting a few shots on the wall shoot a few more after creeping about a 1/4" forward and I will almost guarantee with you current setup that you will shoot a second group above the arrows shot off the wall. As I said earlier I just went through this with my Bowtech Dually and can almost assure you this is whats happening. If you go to the Spot-hogg website you will find excellent articles on creep tuning, but on your bow while at rest your top cam has to definately be ahead of your bottom cam this can be done by first setting the cams identicle while at rest using the cutouts or some other reference to adjust them and then repressing the bow and adding a approx 2 or 3 twist to the cable that connects to the bottom cam. After doing this you must resight the bow as the arrows will now impact higher than the wall shot but lower than the creep shot used to, you should now have all shots both creep and wall impacting together. But remember you do not pull hard against the wall just shoot firmly off it. After you get this done you will be amazed at how forgiving the bow shoots.
Good luck
BD