about the actual wattage of each card:
i was using wattman settings for lowest possible watt, gpu-z showed 50w and wall said 265w
I changed to a rom for 29mhash, gpu-z shows 67watt and wall says 300w
gpu-z says difference 17watt, wall says difference 35watt.

other test:
without mining pc wall 180w
with mining pc wall 310w
gpu-z says 67watt and wall shows 130w difference!

so i conclude that the actual power draw of the gpu is almost the DOUBLE of what gpu-z says at least on my setup

Eliovp any news of your 65watt 29mhash rom? the 85watt 29mhash seems a bit dated.
https://s11.postimg.org/bhtatjpyb/2016_09_15_025508.jpg