Any light grease will work on the rails, I use Slide Glide Light but am not too picky if it isn't 10F or colder out. The lighter hammer spring will help the trigger pull a little, I think mine was 3 lb 1 oz after putting in the same kit you have coming. That was light enough for me, for now. I think you should just shoot it. And dry fire the heck out of it, no ammo around, of course.
Joe