Trigger job complete.... kind of.
The magwell from 3D Printed Gun Gear arrived. Fit is great, finish is good on the exterior, the interior is a little rough, but it's just cosmetic. The inside will eventually get beat up anyway, so no big deal. Their basepads are nice all the way around. I already had some of the Springer extensions that I expected to have to modify to work with the new magwell, but they fit without modification, barely.
Back to the trigger: I pulled everything apart and lightly stoned and polished to smooth it out and get rid of the creep. Most of the creep is gone now and it's smoother, but I noticed some rather odd results. The gun will now drop the hammer from half-cock by pulling the trigger. TBH, I'm not sure if it would have done this prior to stoning since the thought of doing so never occurred to me until after I'd stoned it. I didn't stone the half-cock notch in the hammer, so if I screwed it up, it was due to stoning the sear. I've stoned hammers and sears before on DA/SA Berettas and did these the same way. It's not possible to have this issue on a gun with DA capability though, since the trigger bar will draw the hammer back from half-cock. Since this one may be caused by my tinkering, I'll try throwing a stock sear back in it to see if the issue goes away. Hopefully I can replace the sear without having to pull everything else out again.
My hammer also now has three clicks. First one is half-cock, third one is full-cock, and there's one in between that results in a trigger pull like a very short double action. It's kind of like some CZ-75's where they'll cam the hammer back a bit in single action. In this case, it's a remnant of the DA functionality. In the parts breakdown in the manual, they show a different hammer being used in the non-existent SAO versions, so now I know why. They all use the same sear though. Now I just need to figure out the PN for the SAO hammer and get my hands on one, or figure out the differences and modify mine.