I don't know much about Forte film, other than the few sheets of ISO 400 film I used in 4x5 a long time ago. But I have used a fair amount of their paper, and I got hold of some of the last batch of Elegance Polygrade paper they made before they closed, and it had problems with it too.
I have a feeling that in that last batch they let go of their quality control, because they didn't exactly have a reputation to save. They were closing down, no returns possible. Maybe I'm paranoid like that, but none of the Forte papers I tried up until that point had any of those problems.
Food for thought? Perhaps you just need to forget about Fortepan and move on to using other materials. You will run out sooner or later anyway.
Or learn how to create digital negatives.... But that's a discussion for other forums.
- Thomas