Hardy har har.
First attempt: if that had been my SAT score, they'd have sent me back to 3rd grade.
Subsequent attempts: tons better, then I started playing around with subdividing the beat in my head. 8ths was not a big jump over 1, 2, 3, 4, but 16ths was a huge improvement. There were a whole bunch right on the line, and the ones that were off were narrowly mixed instead of reliably late. I then tried thinking triplets, and this didn't work well. Results still mixed early/late, but way wider range than the 16ths.
All that, and I still maxed out at 871. I'll try again when I'm fresher; I'm absolutely DONE right now.
Somewhat sobering that I tend to be late. I also am a former tuba player, and I thought I knew enough to be on top of the beat and not dragging everybody backward with me. Somewhere, something went very wrong.