Hi, Easiest answer of the day! I've been in the lithographic industry for 40 years and have developed lith film in most every thing. The best is Kodak A B Lith developer. Follow the directions. Usually 3 min. @ 68 degrees. I think your Dektol problem is dilution. Don't. In my home photo darkroom I do this: 2 min. in straight Dektol @ 68 degrees. Lith film is an extremely high contrast material. Images are either black or white. Period! No (or very little) midtones possible. Work under a red safelight and you can watch the image pop up. But give it at least 2 full min. in the soup. Fix. Wash. Drink beer.

Voiola! Fini! At no time do my fingers leave my palms. Send beer!