Thanks for the follow up and good job. It's very satisfying to do this yourself and always learn new things.

I set my hunting rifles triggers to 3 to 3.5 lbs. Since you just went from somewhere around 6 or 7 lbs down to 4 lbs it will take a short amount of time to get used to it and it will feel light, even tho most of us think 4 lbs is heavy.

A final safety check to see if the sear will hold in the worst case scenario is to slap the bolt closed. If it catches the sear then it's safe. If it skips the sear then you need a little more fiddling.

Do it a few times. Slap the bolt closed, and then pull the trigger... If the trigger fires then the trigger didn't skip the sear (obviously), and all is good.