katie From my understanding, PD applications usually have to get invited to apply through similar means to the actual invitations (via email in the following rounds). The PD category is much more flexible in terms of who is invited to apply, though, and much more is taken into account than academic performance/ performance on the entrance exam.
While your scores were very high, the capacity at your school was only 2 people - which was likely what led to you not receiving an offer due to the 4% rule. My understanding is that the PD category doesn’t have to correspond with the 4% rule.
Best of luck!!