Tried the authorization trick; found the key with no problem this time. Seems like it'll do the trick, but I didn't keep the program running long enough to find out for a couple of reasons:
0. The bug came back with the speed not doing what I tell it. This time I've attached a screenshot.
1. When I take screenshots (command-shift-3), I get a screenshot for each display (I've got 2). I tried to delete the other one, but I couldn't empty the Trash afterward because I apparently didn't have the privileges to do so. This happens on and off and probably isn't CPUThrottler's fault. Anyway, I usually fix this by opening up a terminal and emptying the Trash as root. Problem: the terminal wouldn't do anything. It opened up a terminal window with the title "Completed Command" and nothing inside. I've had this happen before, and it always goes back to normal when I quit CPUThrottler. Don't know why.