Can anyone help?

I have 5 sapphire nitro rx470 4gb elpida, model 11256-21-21g with dvi-d conector (the new model, supposedly for mining)

I am using Simplemining and claymore 9.8.

I used ATIFlash and GPUz, copied straps from 1500 to above and kept TDP(W) in 85.

On simplemining, I m using core MHz 1100, memory MHz 1850, power stage 3 but cannot get more than 24MH/S per card

My power consumption for 5 cards is 780W.

Can you help me to increase haste and decrease power consumption?