AF 2.2.3 works, but, after closing and reopening, the sliders are still at the same position (cannot lower memory voltage more than before).
I guess I'll stick with 2.1.0 for now.
On 2.2.3, delete the 2 files in the Profiles folder inside the MSI AB program folder. Next time you open it, it'll ask you to reboot your PC to determine default values, which you'll have to say no to every time, but you'll be able to set your clocks to whatever you want.
On my 7970, I open AB, press NO I don't want to reboot, and slide mem bar down to 750. Close and reopen AB, NO I don't want to reboot, slide mem bar down to 375. Close and reopen AB for a third time, NO I don't want to reboot, and then I'm able to slide my mem bar down to whatever I want (I like 325).