Rob welcome. My experience with FP4 is limited compared to other Ilford films plus some Fuji but I think you may have been very unlucky as I have never experience any real problem with Ilford or Fuji.
I usually leave the film hanging in the drying cabinet overnight and the next day it has only a small curve on it which the glassless negative masks usually flatten. However I have left film hanging with clips at the top and weighted clips at the bottom for 24-36 hours and it was noticeable that the film after this time was even flatter.
As others have said it might be worth a fresh rinse in wetting agent and re-hanging. If you have a drying cabinet do not use the heat assisted fan. At the college where I learned B&W processing the drying cabinets were always on full heat and even Ilford film would curl round a lot in those.
They would eventually uncurl but it could take a long time.
Mike
|