Don, You are correct. They are polaroid PN55 negatives. You are also correct that they are overexposed. That's why I didn't wash the first negative until 3 or 4 hours later because the print was total white with no image. I thought the neg. was also trash until I looked at it later and saw it had an image so I washed it and gave it a try.
From everything I've read and from playing around a little in PS with the curve David Fokos uses for his PT/PD prints, I thought you needed to overexpose to get the dense negative. In other words if the print looks washed out and overexposed the negative is probably close to what is needed. I understand that his curve is based on Arches Platine paper, which I am not using, and the PT/PD process, which I am not using, but I have read the types of negatives needed are similiar. I am probably trying to oversimplify my approach too much.
I will locate a step wedge and follow your recommendation.
Again, thanks for your comment!