IMHO OP you did very well in re the price you quoted for the work done. Over the last 30 years or so I have built a decent number of "carry 1911s" based on Springfield Armory G2 models. Don't know if they still offer that specific model or not but it was a great starting point.
I did trigger jobs with bobbed hammers, fitted Nat Match bushings, Millett f & r sights, beavertail grip safeties, replaced a few springs, polished feed ramps, and did some slide to frame tightening work. These guns are able to hold 1-2 inches at 25 yards from a Ransom rest with ball ammo. They feed a variety of hollowpoints and truncated cone cast bullets as well. Back in the day the base pistol was about $400. I did my work for an additional $200 including parts. Wasn't making a lot of money at it but have a lot of very happy customers from them.
RIA is a solid starting point for a smith who knows what he's doing. Def middle of the road as a starter.
There is a place in the world for "boutique" guns of all kinds. There is also a place in the world for lesser PRICED variants tweaked by someone who knows what they are doing. All but the MOST DEMANDING shooter will be very well served with the latter, and spending the difference in ammo, practice and range time.
Anyone ever wonder why the Russian "Buran" space shuttle mock up looked exactly like our Shuttle. It is because there are NOT multiple versions of aerodynamics, ie Us and Russian versions.
Same thing applies to firearms in a lot of ways. Within the basic framework of a given firearm, there is only so much that can, or needs to be done, to achieve a given level of performance from a given design. In many cases it can be done for a few hundred to a couple thousand dollars. I have owned Wilsons, Ed Browns, and a few others over the years. And to be perfectly honest, I bought them to give them a thorough going over to see what if anything they were doing differently.
If you are capable of it, AND NEED one hole groups, you need a firearm capable of delivering that degree of accuracy. If you need 1-3 inches of minute of center of mass at bad breath distances, well then that is a whole 'nother kettle of fish.
AND, I am a big fan of the 38 Super cartridge. A 1960s vintage 38 Super 1911 was in my safe for quite a number of years. Met a man who loved it more than me, so now it is his.
Enjoy your gun buddy