Ya, I sorta agree with MGS. Maybe you got some other 2c. 5mg of 2ce snorted would have me flying in a nicely visual place. I would imagine 10mg to be super strong up the nose. 12mg oral is a nice dose for me. 15mg is where it starts to get strong. I ate 22mg with a few friends at a festival, and we were toast. I recommended against the dose, but the girls thought they could handle it, and we did handle it, but damn was it strong. Definite mind melter. 15mg is strong though, too. So is 12. I've had a minor, but decent trip on 8mg oral.
2ce is a potent drug. You shouldn't need 20mg to get you going unless you've been partying for days or you somehow managed to get some cut-up ice, or perhaps some different 2c altogether.
Although maybe I'm just sensitive to this shit. 12mg, that puts me in a great place. 15mg, that kinds pretty dreamlike. 22mg, and I'm completely mind-fucked, astonished that my body is still able to get around.
Ya, go try MGS's stash. haha