Is the dosing based on experience or did you invest into some basic pharmacology studies?

Basic pharmacology studies, case studies from like minded individuals and personal experience. (If the dose is too great cut it into smaller pieces next time.)

Also, what's your criteria for patch vs. lozenge?

Do you want to do something specific that lasts 3-5 hours or do you want stable benefits to motivation and focus over a day? You can approximately consider total dose to be a limited resource, based on cycling to prevent dependency and reduced effects.