The ratio of Caffiene to Ephedrine for maximum synergy is 10:1. If your stomach will allow it throw in an asprin 325mg and a few drops of Sublingual yohimbine. See you on the moon.
20mg ephedra/ 200mg caffeine seems to be what most of the pre made thermogenic products on the market consist of. I would forget the aspirin though. I don’t believe it adds much to the thermogenic synergy of these compounds and the potential risk of stomach ulcers isn’t worth it in my opinion.