My son is 8 but they have mostly the same combo of diagnoses. He had his multi day evaluation with the Eides about two years ago and there were several instances of this "doing better with more not less" phenomenon in various tests.
Basically the way I understand it is that a dyslexic brain accesses and stores information in a way different than a plain brain. Part of that includes often bypassing details and looking at the whole. Like misreading the one sentence instructions but understanding the whole reading comp paragraph that follows. The instructions have no context.
Perhaps what you're seeing is a variation of this. Honestly when I stop and think about how to spell an individual word I freak myself out into a weird spelling. My son who also reads really well asked me how to spell "of" the other day. The doing better with sentences makes complete sense to me since it is what we see around here.
Great job on that 98%!
