Tom Abrahamsson discusses Double-X (Type 5222) on the RF forum, not Super-XX, which is a different film.
I've got some as well, and I've been going 6 minutes in ABC pyro, 1+1+1+12 for enlarging paper.
Michael Smith develops by inspection and uses ABC pyro 1+1+1+7, and starts inspecting at 8 minutes for Azo, which takes a contrastier neg than enlarging papers.
Also, SXX is really a nice film for landscapes. It responds to filters in a very precise way, which is different from other films. If Technicolor were B&W, it would look like SXX, I think.