documents and sync data usage

I have been struggling with this problem on and off for years now. Documents and Sync is chewing up TONS of my data and there is no stopping it. I have all cell data toggles turned off for all iCloud syncing etc. but it's no help. I have signed out and signed back in to my iCloud account which has fixed it in the past for a few months but not this time. It is happening on both my and my wife's phone and is very very annoying. As an aside Apple should put a toggle next to the documents and sync category for cell usage like all the other apps in the cell data preference pane so I can just shut it off but I don't see that happening. The solution of "just turn off iCloud" is not helpful because it's what makes my phone work. I have no idea why we can't have control over this whole category to just turn it off... any ideas on something that might work?