Well, I finally got my RM's back from my gunsmith today and plan to shoot them next weekend at our match. They apparently turned into a little more work than was anticipated, but look and feel good now.
He followed Pettifogger's article on arbor fit, and then found that after doing that, the cylinder had far too much end shake (?). He had to build up and lengthen the gas ring to take the slop out of it so the hand would reach the cylinder ratchet. However, now the barrel/cylinder gap is proper and everything is tight and functions well. Also installed the "Ruger" coil spring/plunger hand modification, hardened the internals and tuned it.
They're pretty and should run well for a long time with "gamer" 44 Russian BP ammo.