I'll take a peek at the sys log viewer and see what I might be able to use in there.
I figured monitoring in between would be difficult. As far as I can tell, the speed change didn't result in many discards, there were some output discards, and it's something I had thought of setting up a monitor for. I haven't checked the discards since, but it's something I'll keep an eye on.
Thanks for the suggestions on this! much appreciated.