Hi guys, interesting observation:
I just took the diagnostic and scored a 720, with 46 Q and 43 Verbal.
Funny thing is that I got only 2 questions wrong in quant, and was penalized enough to receive a 46. I do have to note that one of the questions wrong in quant is number 3, which came very early in the game. Perhaps their "adaptive" algorithm penalizes you quite hard by bringing down the difficulty level of the questions if you mess up early.
Got 7 questions wrong in verbal, 4 of which are near the end.