I don't think your problem is minor at all. I very much understand this frustration as my body fights me between 130 and 129.
I have found during my journey that having 2-3 days eating at a maintenance calorie level helps break my plateau. I don't gain or lose in those days but once I lower my calorie intake, the scale starts going down. And although water intake is important, in my opinion, it is not the only culprit to your plateau.
I do believe that bodies have "set points" and it takes a little tweaking to get below those set points but it is definitely possible.
You are doing fantastic so whatever it is you are doing is working!