I think those are huge steps in the right direction! I do like the parelli games, I'm just not a huge fan of the buy my expensive stuff and friendly gaming them to death.
I'd say start laying the laws down on him if you haven't already. Only make good behavior acceptable. If you don't want him in your space while leading more him out, if you don't want him to nip you knock him in the nose, if you don't want him diving for grass reprimand him.
I'd also work on whoa and other voice command while lunging.
Anything specific your horse is doing?
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