XTOL; 100ml or more?

I'm developing a 120 roll of Delta 100 before going to HP5+ in 135, 120 and 4x5 for the next year. Previous discussions recommend 1:1 for 135 and 1:2 ability for 120. My Jobo 1520 rec's a 485ml max working solution. At 480ml I can pull 1:3 with 120ml of developer if need be, but The Film Developing Cookbook rec's 250ml per 80 sq. Thoughts.

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