So my idle voltages don't drop under stock power plans in windows, Balanced, Ryzen Optimized, or High Performance (as expected), but if I put my power plan to Power save, then my idle voltages actually drop down to about .9v from 1.45v. I do see a measurable drop in performance as a result, going from 2037 in Cinebench R15 to 2002. 

I manually went into my BIOS and turned C-state global from Auto to Enabled and this didn't help, only setting my Windows power plan to Power Saver did it... hmmmmm