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Colorcomp can't do anything for BLB. You are usually checking BLB with a black screen, your LCD is already at 0, you can't use colorcomp to go less than zero.
All colorcomp can do is even up mid/bright tones, by adjusting down the bright areas (on uneven white) or a bit of up/down on mid-tones.
I don't use it. It will likely lower your contrast but making whites less bright as it tries to even out the screen.
I don't really see enough uniformity to need correction and I lost ~100 points of contrast using it IIRC.