7970 OC help - Voltage increases not being applied properly?

Hi all,
I have an XFX Black Edition 7970 and am currently working on finding its maximum overclock. It hit 1125/1575 on stock voltages and never went over about 66C under load, so I figured there was plenty more room to OC. I got the newest version of Sapphire's Trixx utility since MSI's Afterburner beta doesn't support a higher OC than 1125/1575, and am currently trying to figure out if it can hit 1300/1800 (or higher) with a voltage bump.

My problem is that all my monitoring programs are reporting that my voltage increase is not registering. I have given the voltage a bump to the maximum of 1.300V and yet haven't seen any actual voltage read anywhere near that. HWmonitor reports a max of 1.17V (stock), as does Trixx's Windows gadget and GPU-Z. MSI's afterburner has reported some voltages around 1.20-1.22, but still nothing near 1.3. I have the +20% power set in Catalyst Control Center, so it should be able to give the card that amount of power, right?

I'm thinking that this means the voltage is not being set correctly - any thoughts? I can get 1200/1700 working fine on stock voltage, but 1300/1800 results in artifacting very quickly no matter what I do with the voltage. Temps don't seem to be a problem - I haven't seen any temp over 70C.

Also, anyone know of any other programs that would be good for trying to put a custom OC on the card? I'm more familiar with the nVidia tools available than the ones for ATI.

My other specs:
AMD Phenom II X6 @ 4.0 GHz (2.8 NB) on Cooler Master Hyper 212 Evo
8 GB DDR3-1333 ram
MSI 890fxa-gd65 mobo
Corsair HX750 750 watt PSU

With Afterburner, have you gone into the config file and altered the "allow unofficial overclocking" value? Set it to 1. Then you should be able to give it higher clocks.

As for the voltage not applying, that depends.

Check out this thread http://forums.guru3d.com/showthread.php?t=357054

EDIT: Also, you're using Afterburner 2.2.0 Beta 10? I think that's the newest one with 7970 support.

BTW I was just checking, and it appears they added an extra step. Just check out the first post:
http://forums.guru3d.com/showthread.php?t=327291