I've never had problems loading 120 film onto Jobo or Patterson plastic reels. Never had a problem with curl. I now use Hewes stainless steel reels, both for inversion tanks, and the special ones for the Jobo processors, and I find it even easier to load than a plastic reel. With some practice, that is.

I just did, all in one batch in the CPP2, an Ektar 100, a Portra 160 VC, and a Supra 100. The first two 120, the last was 35mm. All of them loaded onto the SS Hewes reels without a hitch.