Plz help 570/580 (bios power)

Hey All

I am running Linux OS (Simple mining) and I am looking to tweak my cards. I have a bunch of Assorted 570/580's and I have the memory timings all figured out and stable. However now I am trying to battle the power situation as Id like to lower it best I can (since Watts = heat and power consumption = $$$).

I've been using the power stage (DPM) feature I find it hit and miss depending on what im trying to do (I simply don't like using it for tweaking)...so id like to mod the BIOS on the cards and hard code the voltages.... Is this a viable solution ? am i on the right track. I hope my understanding of this is correct.

CURRENT Values: *large values/numbers are configured by vendors. Are they ranges of power i think? (general binned values for mass sale... since not all cards/silicon are equal)
Mhz mV
300 750
588 65282 (DPM stage 1)
952 65283 (DPM stage 2)
1041 65284 (DPM stage 3)
1106 65285 (DPM stage 4)
1168 65286 (DPM stage 5)
1209 65287 (DPM stage 6)
1244 65288 (DPM stage 7)

GOAL To Hardset mV value: (I wouldn't know what exact values to put in here.... but this is estimation) can you guys help in this area???
Mhz mV
300 750
588 850 (DPM stage 1)
952 850 (DPM stage 2)
1041 850 (DPM stage 3)
1106 850 (DPM stage 4)
1150 875 (DPM stage 5)
1200 900 (DPM stage 6)
1250 950 (DPM stage 7) 1300 1000 (< would be cool to hit a high core but limit mV)

Am I on the right track ? Can this be done by hard-setting BIOS values?

Cheers