IMHO, any of the "violations" you mention would merit at least an end to shooting for the day - even the "1 star" ones. For example, failing to check for an empty chamber could result in leaving a loaded rifle on the line pointed downrange (presumably) where people are walking around.

Maybe that is too harsh.

One other thing you might want to think about doing - if you haven't already - is to set up drills re what to do. Practice shooting a few rounds, making sure the action is clear, making sure the range is clear, walk and reset the targest, walk back, etc. in short sessions where you do nothing but watch and don't really shoot any yourself so your attention isn't divided. Once you do the drill a few dozen times, the good habits will be come instinct. Same thing with drilling re what to do with misfires.

One thing my dad did with me was to load the gun and then hand it to me. Every now and then he would load a snap cap instead of a live round. That would do two things: demonstrate if I was flinching on trigger pull and also provide practice for how to properly clear "duds".