when you adjust your brightness or contrast you are adjusting for that page, not for the MFCD.
your page is DSMS, adjust the contrast and brightness....you are seeing now the TAD, you have also to adjust the levels....so forth so on...when I am flying at night, I have to set all the cockpit lights, MFCD for each page, CSMS, HUD, every light in the cockpit after the 2.5.6 update. it's a pain the ass...not counting the TGP Smoke problem. Is sad because the A10 is the only complete module in DCS from ED.