Howd you increase voltage offset from -100mV AB max to up to -275mV if you don't mind me asking?
I just control the voltage controller directly through i2c command, also added the offsets directed to the BIOS for a more permanent solution.
You're able to use i2c commands? My RX580 fails AB i2c dumps and WattTool can't connect to the i2c. How are you managing it?