Maybe it's like I theorised, that there is an override to push from DIK to perma Neutral during the exams if you're on a jill only route?
No it's to do with the amount of choices you made it's not about defaulting
You need to make 11 dik or chick choices to to remove the bars on the opposite side essentially you need 11 of the 15 choices to be considered perminant DIK or perminat Chick.
IIf you make your first 5 choices chick, then the last 10 choices dik you're going to get neutral as it's a 10-5 ratio despite your last 10 choices being dik... Its not an override, it's just how the system works.
When it comes to Jill and the "fight for her choice" you've already made 13 choices and you've got to be neutral here at best your 7 dik choices 6 chick. You only get 2 more and even if it's DIK choices it'll only get you to 9, not the 11 needed