Thanks for the updated bios and the instructions, updating BIOS and Bay vBIOS went smoothly.
I was looking to increase the overall GPU-SLI stability by slightly overvolting, that's why I did the mod. Never wanted to go beyond that "+135" or so. However, after the mod, the GPUs just won't overclock at all, though the OC range seems to have increased by a lot. The clock never goes beyond 1058MHz. Downclocks just fine.
Did a clean nvidia drivers update, reinstalled MSI Afterburner, tried out the Nvidia Inspector and EVGA Precision and nothing seems to work.
P.S.: I have no thermal issues whatsoever, as I have modded my fans by adding switches to their brown wires (I can have them spinning as crazy at will)