One more dumb question: I noticed my trigger blade and trigger blade rail I guess it is (?) have quite a bit of side to side movement/play. The bottom of the trigger blade probably moves 1/8" and feels loose. Is this normal?
Also it took quite a bit of force with a 2.5mm allen driver to loosen and then retighten the trigger blade.
As long as the two bolts holding the trigger in place are tight, it's fine.
Most AI's have some side to side movement. You can actually use that to make sure you're pulling straight back to the rear and not pulling or pushing the rifle with trigger finger.
Put the pad of your finger on the trigger then move your finger back and forth. If there's room on both sides, you're good. If you notice you're pinned against one side or the other, you know you need to work on the press to the rear.