I would go back to just working on engagement, as that's the main trouble (it seems) that you're having. He's already learned the commands, he's just not focused or willing to do them.
Do short sessions, make them very rewarding, end before he's tired of working (basically, end with him wanting to play more, or earn more treats). My goal would be to just work on eye contact.
An e-collar would teach him to obey or else, but you wouldn't necessarily build up his desire to do so.
As for recall, if he's starting to ignore you, put him back on a long line and don't give him the opportunity to completely blow you off! Or have someone help you and try to do restrained recalls after you've build up some desire on his part to participate! Or even, work him on a 6' leash and put a lot of enthusiasm into your recalls, he'll only have a short distance to go to get to you, but hopefully you can focus on speed and quickness of response that way.
Murdock, BH - GSD
Virgil, CGC - GSD
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Tara, Reagan, Madison, and Jefferson - Aussies