I'm also tried OC Guru II and Extreme Gaming + settings in GeForce Experience, but no luck, in first both is not settings for LED and changes with LED in GFE not working at all. What about this, manually via "C:\Program Files (x86)\GIGABYTE\XTREME GAMING ENGINE\Led" Could you try it TNTWildfire? Because I'm not at home right now. I'm also uninstalled Nvidia drivers and all GPU utilities and removed everything related via driver sweeper (Display Driver Uninstaller), but after clean driver installation problem with LED control persist. Otherwise clean Windows installation should fix problem, but it is not comfortable, because it is just color...
References:
https://www.reddit.com/r/nvidia/comments/4u4m1v/gigabyte_1060_gvn1060d56gd_249_rgb_issues/
http://www.tomshardware.co.uk/answers/id-3121941/gtx-1070-gaming-leds-control-problem.html