I finally got around to testing more & come find out that in driver-btm-c5.h I had to change:


to


Before it'd actually USE the voltage set.  Logs would SAY it was setting/using the lower voltage but Watts read at the wall didn't change much if at all until I changed that.  So far the best I've found is 710 at 200Mhz gives 1200+ GH/s for only ~140 Watts per card which is MUCH better than the same speed at 235 Watts per card before. Saving 95 watts per card at 200mhz!

Keep in mind my goal in testing was to try & get the power usage as low as possible yet be reliable & not overly concerned with the hash speed thus running at 200 mhz.  1200 GHS is pretty respectable for 1 card using 140 watts.  I should be able to get 3600 for ~420 Watts & very low heat & low/quiet fans.  (It's very quiet now at only 41C & 2000/2400 fan)  

Now I need to test at 710 but raise the speed as long as it's reliable & compare the watts per GHS.  Test with all 3 cards again as well but I was interested in lowering power usage thus only using 1 card.