I actually just fixed it... Installed the old TrIXX, reset everything, restarted, and removed it. Now the voltage changes like it used to, down to 0.825V at idle and ~1.16V under load.
As for locked voltage, I don't think that's the problem, I could change it fine, it just didn't work the way I intended for it to. There is a box in the settings that said "Force constant voltage" which was unchecked but it was still always constant, and for some reason when I removed TriXX it was still constant.