You might consider changing your base to a Steve Stratton 6-screw base if that's not what you already have. With it's multiple slots you can move a scope forward further than a with a 4-screw base. Besides from Steve, I think you can get them from MGM and maybe Bullberry. While it would be preferred to have the 2 additional screws drill and tapped, because they are steel you wouldn't have to. Seems like they run about $35. I have several of them for Contender barrels from the Virgin Valley days, and they are some of the best scope bases made for TC's.
Another possibility would be to add a SSK T'SOB base and rings. Same multiple slots for the rings.