So out of frustration with the GS I've decided to try and mod the drivers and tweak the EDID myself. The trouble I'm running into is when I try to update the driver for the Fit Headless GS I get the error "The Third-party INF does not Contain Digital Signature Information ". Any idea how I can get around this? Googling it return a couple different options for disabling signature checks within windows, but I've tried those and I still keep getting the error.

Sorry to hear about your frustration.
Unfortunately Compulab does not support this action.
Is there a functionality issue with the product not working as expected?

I now see the other thread you've posted:
viewtopic.php?f=161&t=6329

Unfortunately, the answer still applies in this case.