I am not a chemist or chemical engineer, I grope my way by trial and error without the aid of sophisticated analysis machines. I have found Delta 100 to perform to my liking by rating it at 125 - 150. Using Kodak produced Xtol my development times are less than 8:00 with Jobo rolling development. I do not pre rinse. I like your findings and hope you will detail the formula's for the Concentrate and D316 in layman's form.