Power consumption is crazy but the temps are really cool. What's the ambient temperature?
Please undervolt your cards using OverdriveNtool. I used to get around 29-31 MH/s with cards like RX570s and RX580s consuming 65-75W per card and the temps being 65-75C.
Drop the core clock and memory as much as you can until the card becomes unstable and pump up the memory clock as much as you can.
Also, try different modified BIOS according to the memory vendor of the cards.
NOTE: Please backup BIOS for each and every card individually before performing the above. If you brick it in the process, it's a pain to get it working again.