My DS 420 has a small hump in the string where it crosses over the rail. Having read numerous posts, this downward pressure doesn't seem to be the ideal situation. I checked the cams and there doesn't appear to be any available space to shim them up. There is a small gap ( I'm guessing 1/32" or so) between the top edge of the limbs and the limb pockets that could be gained if a shim were to be placed between the bottom edge of the limbs and the limb pockets. Is this a worthwhile endeavor or would it be better to leave good enough alone and put up with the likely string wear??