FWIW:
I think of equal importance to size in a 45ACP cc pistol is that firearm choice being a da first round.
Or, a "cocked 'n locked" anything, no matter the quality, price, or size is simply not an acceptable choice FOR ME in a concealed carry weapon.
I love 1911's myself, but IMO that platform is not the best choice for a cc pistol..
The 45ACP I prefer to carry, when I carry a 45, is the 3rd Gen S&W CS45.
The only downside to the CS45 is many people are not happy with the thickness of the grips (a Hogue design I believe).. But there is a gentleman (BIGDOG's Delgrin Grips) that takes the thinner factory grips for other 3rd gen Smiths and "alters" them to fit, and function perfectly in the CS45 (or CS9), and from all I've read the altered grips are thinner, and are very popular.
I'm not a large person (ok, I'm a quasi-runt), but I find the factory grips on my CS45 just fine.
This is not a knock against the 1911 pistol, I just think that for the specific purpose of being carried concealed most folks want a firearm that can be "pulled" and fired without cocking/safety on/off concerns, and that's is something a 1911 does not offer.
Just personal opinion, no offense to ANYBODY.
Additionally 3rd GenSmiths have a reputation for absolute reliability, my number one priority in a firearm carried for self defense.
Best Wishes,
Jesse
P.S. As seen in the photo below the CS45 does have an external safety/decocker (both sides actually)for those who prefer them but when I carry my CS45 concealed I have the safety off, and rely on the heavier 1st round d/a trigger pull to prevent accidental discharges.