Is it this? Or something similar?
YHM-2189, 2189, HUB Direct Thread mount
yhm.net
And to be absolutely sure, the Hub bit isn’t loosening, but the DT is coming off the barrel, correct?
Are you shooting on a semiautomatic subgun? Semis seem to loosen cans way more often than bolt guns do. I like secondary retention cans for semis. For a 9mm, I have a tri-lug adapter.
Anyway, I see no reason why 20-30ft/lbs would mess anything up unless you have a thin barrel. There is a possibility of trumpeting the crown area if you are too aggressive with a thin barrel and use a direct thread attachment (going by memory here, I believe that’s correct).
You need enough meat on the barrel to avoid that.