I've compiled a video that catches all of the chirps/screeches/grinding much better. I think it's much more clear. Currently the car's at the dealership but I haven't heard anything back yet.
Getting up to speed and coasting, no shift = screech
Manually downshifting from 4th to 3rd to 2nd to 1st = screech/grind
In manual mode, no shift, and applying throttle from a lower speed = grinding