I recently bought a roll (100ft) of Tri-X and am experiencing something I had not experienced previously with a bulk roll of HP-5. After processing and air drying the exposed film, the negatives are curling edge to edge, to the point that they are difficult to insert into negative holders and darn near impossible to scan on a flatbed scanner. As I mentioned, this has never been a problem with HP-5. I also experienced this, much more severely, with an expired roll of Plus-X I just developed. I wonder if, being winter here in Vermont, the air is so dry that the film is drying too fast. Even the HP-5 is doing this more than it used to. Any ideas/advice?