.22 1911 conversions have been an interest of mine for 20 years. I have owned just about everyone available: Kart (5" and 6"), Day, Colt, Ciener, Marvel 1&2, Pachmayr (yuck!), Jarvis, and Kimber. One thing you immediately learn when messing with these things is that they are incredibly finicky. My most reliable unit is a Marvel Unit 1, but it doesn't fit in a standard holster, so I typically shoot the unit 2, that fits the holster well but gives me some sort of bobble about every 75 rounds. Not good enough for match winning scores in my opinion.
My new pistol shooting passion is Steel Challenge with my iron sighted 9mm EGW gun. Part of my practice regimen is using the .22 unit to lessen the expense and try to "push the envelope". My best runs are typically with the .22, but not always.
To optimize reliability I use only CCI Mini-Mags. They aren't the cheapest, but they are clearly made to a higher standard than most other .22 ammo and have enough energy to cycle any unit briskly.
My metal mags (Marvel) have all been tuned in accordance with Bob Marvel's protocol-what a pain in the butt. I have 3 polymer mags to test-Marvel, Kimber and Advantage Arms. I think the Advantage will be the winner, but we shall see. If these don't perform to my standard I am going to bite the bullet and buy a Tactical Solutions. Their mags are rumored to be the best. I have handled them but never used them...will report back...