You didn't mention the process regards removing the old, original foam from the stock seat pan. Was it glued on? Hard to peel off? So ... essentially ... you left out the whole middle of the installation.
Also, did you not GLUE down the new Pro Cycle foam to the pan .... or does it just sit there, held by the cover staples only?
I'm thinking its very good the new foam is stiff to start off. It will definitely break in ... and if it's proper seat foam it won't clap out after a year of use like the junk foam does. Let us know!