Don't mess around with the power settings. Could be that you're anticipating the 'kick' at full power and your body muscles change which will change...
There are many different thread sizes for moderators that have been in existence for many years including variations of 1/2" dia, 5/8" and up to M28....
Parker and hale silencers have been made long before going back as far as the war. As for the finer thread, a bad idea, reason easy to cross thread a...