I will give it a try with that driver, thanks. Also I didn't do any bios mod because I was afraid of making performance worst instead of getting it better.

Edit:
Finally finished installing the drivers with a clear installation. Claymore now "stop working" as soon it detect all 4 GPUs, I guess it might not work because of the R9 series .... I think I will try just the RX 570 alone to see if the driver would make a difference to the mh/s or work.