I would retake . . . unless, are your grades really good? I would suggest Barron's for the PAT. If you just improve that score you would be very competitive.
Most schools have some sort of minimum before they send secondaries or invite to interview. I would immagine that most would eliminate PAT below 15 or so. . . . .but it never hurts to call. often they will tell you on the phone what their numerical cutoffs are.