First, I would recommend you switch to the tetenal kit. Much better results, and you get a stabilizer final rinse that also eliminates water spots.
That said, temperature plays a big roll in the curling. Kodak had guidelines on this on their site. Anyways, you want the film to be final rinsed in the stabilizer at room temperature. Ank keep the room temp around 70 when drying. I hang my 35mm with a clothespin hanging on the bottom to act as a weight. After it is dry, I roll in around a tube, opposite to the way it was in the canister. That is, with the emulsion side facing outward. 1 day like this eliminates both length and width curling. Same for 120. Hope that helps.