I use MSI Afterburner to tweak (although I'm using Asus Strix GPU), I learned from the forum members here too.
I tweaked to increase GPU memory frequency, incremental of 100MHz each time, click apply and let it stable for at least 10minutes, you can see the hashrate goes up real time, if PC is stable, I repeat the same step, 100MHz incremental  until your PC hit instability, marked that unstable frequency and dial back.

After achieving stable memory frequency, you can play around with GPU power level dial also, that should help to lower your electricity bill abit, and enjoy lower temperature.