A few updates.
Well got it to the range today.
The feeding is still a little odd. It didn't fail to feed, but you could feel it hang up cycling a few times. I took the shims out of the feed ramp because the feed ramp appears to serve to locate the mag. The mag wobble is actually due to me shimming the feed ramp. With the feed ramp lower, the mag wobble is gone. Need to pull that video down. Anyways, what I need to do is make a shim that matches the bottom of the feed ramp dimensionally, that way the feed ramp is higher, but still engages the magazine. I might also weld it and machine it flat (would have to pull the barrel for that).
The chamber polishing has helped a little. It still fails to extract, but not every single round like it did a first. At this point I am convinced the extractor and or spring needs replaced. The fired brass looks fine where it engages the chamber which indicates to me the chamber isn't rough anymore. I also noticed that the ejector just barely grazes some of the cases. The ejection is also erratic when it does eject. Some of the cases are thrown correctly like I'd expect for an AKish weapon. 10 ft forward and to the right. Other just barely make it out of the gun (some not at all).
You can drop a couple lbs off the trigger by tweaking the trigger return spring. It is way heavier than it needs to be.