After editing the file - I got some green +/- bars for those two voltage areas, able to + or - the mVolts by 1 up to 100 in either direction.
But if I tried to touch them at all, as soon as I hit reply, they reset themselves. I did restart after burner after editing the file as well.
Can you post me the content of your GPU's profile ? At: Program Files (x86)\MSI Afterburner\Profiles