Yes, I understand that, but that still doesn't seem to add up right to me. You seem to have gotten a perfect score on the optional writing section, so let's just ignore that since it would only increase your overall score. Your score was 800+800+590 out of 800+800+800, which is 2190/2200. Just applying the same ratio to 1600 gets 1592 on the 1600 scale. If I adjust for the fact that the 1600 scale is really "the same math test and writing+verbal combined into one score), I get 800 + (1390/1400)*800 = 1594. Right?

I know this isn't important, I'm just trying to understand where my math is breaking down.