Just a thought...
I ran into that exact situation when I was doing a bathroom remodel. My inspector, (that was an electrician prior to becoming a city inspector) was very cool. When it came time to inspect my toilet, shower, and sink drain and vent lines, he was almost sure that what I had put together wasn’t correct. (I, being human in nature, thought what I had installed was correct). My inspector called in another city inspector, (that use to be a plumber) for a second opinion, and sure enough, I guess what I had was wrong, and I redid what I had. My point is, (because we are all human in nature), make sure you are correct in what you have installed. If you have a friend, of a friend that is a plumber, see if you could have him come over and check out what you’ve installed. Maybe post a photo of what you’ve install, and let the experts and this forum that a look at it.
I’ve also had an issue with some electrical work that I’ve done, where I did call down town, for clarification, and I did get another inspector out, and it did pass.
Wish you the best of luck with this one!
Mike