I don’t know if this will help anyone but I put a very good shooting Tikka 6.5 creed in a Rokstok, which took a bit but seated fine, and it shot like crap. After reading about lug issues here I pulled the stock, pulled the MT lug and compared them. The MT lug was visibly taller when compared on a level surface. I put the factory lug in the Rokstok, tightened it up and the gun was back to shooting lights out.
I sent an email to UM just letting them know what I did and promptly got a reply thanking me for letting them know.