Thank you for your specification.

At the moment with my RX570 sapphire nitro+ on hynix memory I'm reaching following hashrates:

1200 - 2150 Oscillating between 31.8 - 32.2. But with a power consumption that is far too high. (165 watts on wall).
1150 - 2050 Oscillating between 30.3 - 30.7. But with a power consumption that is still too high. (135 watts on wall).

I've talked to someone who shared a video proofing that on the same card with the same memory in a 6x rig he's making 31,3 stable for weeks and months with a consumption of 100-103watts per card. I'm hardly trying to reach that level.. but'm still far away.

Any hints on how to solve this?

Thank you in advance!