Triage is a flawed concept in this context. In the real world, triage is used to quickly classify subjects and leave their treatment (if required) to someone dedicated to that specific purpose. But, when the subjects are simply posts on the Internet, there is no reason for hurry. No poorly formulated question will die if not treated fast enough. Also, no-one is sitting and waiting for the arrival of new posts requiring editing. Volunteers come by in the H&I queue when they have time.
Triage and H&I should be merged into a single queue. "Requires editing" should be replaced by "Edit" and the reviewers, if they feel a post "requires editing", should be welcome to improve it themselves.
The way it is now leads to situations where the Reviewer in the Triage queue knows how the question should be edited, clicks "Requires editing", and the question lands in someone else's hands in the H&I queue. This Someone Else cannot read the original Reviewer's mind, doesn't know how to edit the question, gets p***ed off and bans the Reviewer (possibly with a wrong justification).
The Reviewer, not being able to understand the reason for the ban, decides to refrain from further reviewing.
Other than that, I agree with the OP's proposal 4: Implement a compulsory tutorial/guide when users gain a potentially damaging privilege (not only review).
