If it's really taking all your elevation to get it zero'd at 100, then it's WAY more than a 1 moa cant. Have you tried a different base, or are you sure it's not the base? You can do the "easy fix", and use Burris signature rings with the offset inserts, or you can do the "hard fix" (expensive but more "correct") and send your receiver off to SSS and have it straightened. May as well have it timed and trued while it's there, and again, may as well have a comp trigger installed too...

;D