Tahnks so much for all your help

The binary method would be some help, but with ~ 15 minute delay for that status bar to update, it still would take some time.
However! Brilliant news, I had already narrowed it down to being among 60 torrents I'm seeding.. and today I had the brilliant idea of maximizing my uTorrent window, flipping to the Files tab and making it big.. my screen is hi res so a lot of data shows at once. I just arrowed down through those 60 torrents, while watching the files tab for the color red / skipped / incomplete files.
Took about 2 minutes! and I discovered I am ..

.. to blame.
Actually, no SFVs or tiny files, it was major skipping in all cases, and intentioned at the time.
I realize SFVs are supposed to be attachments. I did see one in some torrent or other once but I forget which

In the future I'll report it.
Thanks again Freedom Kira, you're so kind!
bl