This may help not too sure.
Basically my face is a a fair bit lighter in the middle when compared to the perimeter. I'm NC42 -44 dependent on the seasons of the year. Although, I no longer use MAC foundations (dare I say that here!) as they either turn orange on me or cause me to really breakout. I now use Prescriptives in Tawny which is my perfect colour match.
What I have found that works well is to apply my usual foundation, powder and blush. Then apply lightly Bare Escentuals Pure Radiance to the middle of my forehead, on the skin between my nose and cheekbone, on the tip of my nose and the bony part of my chin. I also sometimes use it on the tops of my cheekbone as a highlighter. It seems to illuminate my face, make it more contoured and gets rid of the mask effect in the centre of my face. Also worked well with Tropical Radiance, which I used when I had a major tan after a holiday in Italy. I have also tried Clear Radiance but that was far too ashy and white. Oh, and should add, tried Radiance with Nars Powder Foundation that I had lying around; didn't work seemed to make my skin look grainy.
Couldn't get on with BE foundations, could not get the right colour match no matter how hard I tried. But I now could not be without my Pure Radiance. Next goal is to try Bare Radiance. Hope that helps