Clay: No, I didn't use a contact printing frame, just two pieces of glasses. Five minutes...sounds like heaven to me.
There's one thing I can't understand. Should there be anything wrong with the paper, the solution, the tubes or the glasses, the part that was not covered by the Pictorico film shouldn't have reached its Dmax within 2 minutes in my first strip, and in totally dark too in the following strips with longer exposure time except for the four-hour one.