[toro_mike]

Developers based on pyrogallol or catechol, especially in dilute solution and limited sulfite content, may not respond well to rotary processing. These developing agents are very sensitive to aerial oxidation. A rotary processor is constantly introducing oxygen into the developer.

RE: HC110 - I have yet to have problems. Maybe the Unicolor rotating base is slow/gentle enough. I've used numerous dilutions (from B to H). I do drop the dev time by about 20% as per recommendations around the web though.

EDIT: No presoak either.