If you're in Gate A, you want to be one of the first to enter. If in Gate C, you want to be one of the last. (However, I've found that there is some of the distortion even at the outer edges of the center section.)
I'm pretty sure that rule of thumb applies to all three concourses. I started an extensive thread on this a few months ago, and then verified it during my January trip. (I'm the one who preferred the very front corner of row C1, rather than being in B1)