Thanks for the tips and links, Fasteddie01.

Today worked the trigger over. I smoothed everything, squeezed the housing together to eliminate side-to-side play, and replaced both springs. The small front coil spring I replaced with a lighter spring I had in my junk stash. The original spring is made of .028" wire and the replacement spring is .020". The other spring (the one on top that pushes the sear up) was also made from .028" wire so I made one from .025" piano wire. Results: 4lbs and smooth with just a hint of creep. I'll take it.

I extended the bolt handle by driving in a shortened piece of 38 Special brass. I used some green Loctite to bond it in place. Better than stock, but still not satisfied with it. Likely I'll just make something on my lathe.

I drilled and tapped the mag release for a 4-40 screw to make it easier to push. Much better.

I'll put it back together tomorrow.