I'm in the exact same boat. I felt very confident about the morning going in, but I really was thrown off in the first hour, mostly by the AASHTO and analysis problems, unfortunately. I should have just started with the material specific questions and given myself some extra time for the rest...
Just to help clarify, it sounds to me like the author of the PPI SE Practice Exam is asking for constructive feedback on his book to incorporate while he is updating for the new codes.
Joe, I haven't used it yet but plan to for the Oct SE exam. Looking forward to the updated version!