Yes, the curl is definitely in your favour for 5x7 and longer. I think Jim Galli uses it for 5x12 or 5x13 or something. It was he who allayed my fears about using it as sheet film.

If it were possible to cut the aerial stuff to 220, that'd be very sweet. You could probably fit quite a few extra frames on a roll. I briefly worked on modifying an office shredder (!) to cut the 5" rolls to smaller sizes, but I just don't have enough time in my days...