Could I have some help pleaseeee...

Rig overview:
Win 10 Pro
AMD 16.10.2
XFX RX 480 8GB

Issue:
When running older AMD drivers, I am able to load custom ROMs (using the driver sig method).
After updating to 16.10.2 the drivers are showing a warning in Device Manager... therefore Claymore will not mine.

Troubleshooting carried out:
Reset WattMan
Flashed back to Stock ROM
Uninstalled GPUs in Device Manager
Ran AMD Removal Tool
Installed 16.10.2 < GPUs working on Stock ROM at this point.
Flash custom BIOS (Boysie Low Pwr 29Mhs) < Was working on older driver without issues

Am I missing something, why cant the custom ROM load with the newest driver?