@tnar Actually... getting some files completed rather than have them all complete at the same rate seems to speed things up.
I noticed something else. The files set to high priority that don't complete seem to have some packets tied/overlapping with packets of low priority files. So, this phenomenon probably only shows up with collections of mixed priorities.
I tried to test this by setting the low priority files do DO NOT DOWNLOAD to see if that prevented the high priority incomplete files from completing. It did NOT. The high priority files not only completed, but also the files set to DO NOT DOWNLOAD completed.. making me think those DO NOT DOWNLOAD packets are tied to the packets in the other files.