Well, I know it would be hard to find those upper and lower limits and, most likely, they're also very dependant on each individual. It's also very difficult to measure.
Also CH-Hell, 15-20 dry grams is really high. Do you eat them with empty stomach? Don't you trip way too much? If you were to eat only 5g or 2g as most people do, it wouldn't help you with the CH? How did you test this?
I'm a noob in my first busting attempt so I'm very curious about all this. Thanx in advance.