Your experience, in my opinion, does not conform to the normal trend. I guess the Kaplan
, (I dont know about Barron) being harder than the other tests, geared your mind towards a certain type of questions. The PP is vastly different.
For example My scores Kaplan
640(DT), 600, 680.
PP: 720, 750.
I wouldn't fret too much. Just check out where you went wrong and take it from there. Best of Luck!!!