I'm not suggesting you change vets when you have a silver rated one that you are happy with, plus the stress of each visit anyway - just that it's worth taking a step back at times, and that he doesn't seem stable enough from what you are saying to stop what you are doing. My thought was: If a vet saw you now for the first time, would they suggest metaclopramide with the current symptoms (rather than he's already had X day's worth, so that's it)? It's a matter of getting this across without causing friction, especially as you have come this far. Ask why they want to stop when he's not eating well enough to sustain himself without additional feeding at the moment, so there is the risk of continued gut stasis - and if there is any harm in eg another week, then review, just to be on the safe side.
Maybe collect a day's worth of poo to see what he's actually producing, plus weigh him next time you go in. If his poo is completely normal in size, quantity & consistency, and he's at the same weight, fair enough - he's just needing support with feeding rather than gut motility.
I've had rabbits on metaclopramide for several weeks before, so my feeling is that the risk of prescribing a longer course is less than the risk of stopping it. It may be harder to get back to where you are if he goes back into stasis.
I also don't want you to be put in the position of the vet asking you to consider PTS again when you don't actually know what the cause of this episode is, and he's doing well with the additional care and is bright enough in himself. It's still relatively early days for the antibiotics as well. I would want to discuss / exhaust all reasonable options first (and maybe a few unreasonable ones as well - my vets know me well

- but that's how we learn). A lot of people are not able to provide the additional support you have, so that should be taken into consideration as well. There is still a bias towards people not wanting to spend that much time or money on a rabbit, so may be more readily offered PTS than for other species.
Don't forget - You are doing a brilliant job.
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