I'm able to appendix carry a 4" Springfield XD mod2 without too much trouble. The 1911 seems to have roughly the same dimensions, though maybe a longer barrel depending on which specific one you have. Since I started carrying I've switched to wearing slightly larger shirts than before, so that they don't print and ride up as much. I guess my main concern with carrying a 1911 would be the weight of it, but that's more a comfort thing than concealability.

Practice is obviously good, but the smaller guns are going to be inherently less accurate than the larger ones. The Ruger might be a good compromise, if you're not looking to make any further purchases. If you are, then the Sig P365X and Springfield Hellcat, both with red dot sights, might be worth looking into. The RDS makes sight radius no longer a concern, so it narrows the gap between smaller and larger guns.