Only one pin on brake flew off on the first shot. The others took from 5-15
shots before they flew off. So one was misaligned from the start but the
others "worked loose" into being misaligned.
I have threaded several AK rifles 1/2-28 that had barrels that were
.508"-.512" in diameter without any problems or tightness.
Your barrel being only .023" larger than 11mm a 11x1mm split die should have
no problem cutting the threads. But this would require making a muzzle brake
or making a 11x1mm to 14x1mmLH adapter.