ORIGINAL: mesae
I don't follow your argument. If the anhedral had anything to do with the burners, why would they swing them down closer to the exhaust, then make them heat resistant, rather than just leave them up there horizontal at the attach point...
Look at the pics again.... the tips of the stab are not "heat treated" > its the center section which is in the line of "fire"... thus was moved up as far as could be... obviously not far enough so it had to be heat resistant... this is the reason the attach point is so high and the tips of the stab were brought down closer to the thrust line... thus the anhedral