Hi Mattthev,
it seems that you have magician hands when it comes to tune the gpu bios. I am interested in your service.
I opened this topic yesterday at bitcointalk https://bitcointalk.org/index.php?topic=2013941.0
There are some screenshots and the origal bios.rom file.
The GPU is Gigabyte Gaming RX580 8GB Hynix with only 22.5 MH/S
Please take a look and let me know how much you can tune the MH/S up and how much you can tune the watt down.
Thank you!