After doing your 'flick' (which is how I do it too) and unspool the film, are there still droplets on the film, or is it evenly wet?(posted 8741 days ago)I have noticed different film's curl substantially more than others during the drying phase. Konica IR is one that really curl's before straighting out when dry.
what is the temperature/humidity of the room you dry the film in? could this be a factor? Maybe it's to hot and it's drying to quickly, or the reverse (I don't know, just a suggestion)
My 120 APX-25 drys beautifully with a distilled water rinse containing a few drops of Ilford wetting agent. I leave it in this for 1-2mins, do your 'sideways spool flick', then hang it in the shower. The room temp is anywhere from about 18C up to 25C.