Rock,
Before I'd send it in again, I'd find someone else with a frame (maybe your local gun shop has one they'll let you use for a minute) and try my barrels on it. Some solid bolt barrels will have trouble on newer frames, some won't. If they work on another frame (newer model like yours has been modified to) then the problem is most likely the frame. If they don't than your barrels will have to be updated to the split bolt. After you try another frame contact TC again and talk to one of their tech reps. Every time I've talked to them, they give lots of info and ways to check other stuff before telling you mail anything to them. Nice folks most of the time.
Helicopter Bill