Since my image was already dark to begin with, I would think that a faster shutter would make the scene darker. But I guess the higher gain would compensate?
Its all scene dependent of course. But generally this is normal for me for my 4K-T's
Because of the glare from the water I tend to have to keep the Gain and Exp Comp down a bit. In other scenes I'm closer to 50 default on both with 0-2 or 0-3 Exposure