All of my Contenders except for one stainless frame are '79 to '81 vintage and I have yet to have a lock-up problem, solid lug or split, on all of my barrels. I think you "done good". The safety being missing is no big deal, it's useless anyway.
Curtis
P.S. About recoil, you are right. My 44 mag octagon is much more unpleasant than even my unbraked 14" 375 JDJ barrel.