Got the gun back today. Took it to the range and fired 50 rounds through it, with no issues. Didn't really feel lighter or smoother at all, despite the rebound spring being 5# lighter. Also felt kind of gritty.
Took it home, removed the side plate and sure enough, dry as a bone. I mean, I didn't expect him to grease every contact point with tender loving care, but a 1/2 second spray of Rem Oil would have been better than NOTHING! Seems pretty unprofessional to me to reassemble a gun without any sort of lubrication.
I also got a mystery spring in my Wolff spring pack. I had not taken a rebound slide spring in with the gun, other than the Wolff one I wanted installed, but I got one back...so either he put a replacement stock spring in the gun, and never used the Wolff one (it is restapled), or he gave me a stock spring and put it in the Wolff bag.
Kind of confirms my suspicions that there's no such thing as a professional gunsmith any more, unless they only work for factories. Just because someone has a set of screwdrivers, a sight pusher, and a lathe does not mean they are qualified to work on guns.