Yes and no. The occasional ridiculous roughness hasn't come back, except for the once after the work above. So I don't think those thongs fixed it, but seems to have gone away on its own.
Generally at idle it is still very slightly off - but not enough that anyone except me would notice. I feel like there is a slight roughness on light throttle, but smooth as under heavier load.
Overall, I wouldn't be surprised if there is a slight vacuum leak somewhere. As much as the perfectionist in me hates it, it is probably best to leave it and see if it gets worse. If it does, it will be a lot easier and cheaper to diagnose!
Also have some wear in the centre tailshaft bearing which is getting fixed next week. Might be worth seeing how that goes as it could explain what I'm feeling under light acceleration.