I dunno man..maybe you just do have a really high tolerance. That dose would definatly be enough for most people.
You can brew up 5g of rue into a tea and try that..I would not go above 5g though still as you never know. If you really think you are tolerant though than maybe you need that much.
I dont see any reason why caapi would work any more than the rue. You might need to take alot of caapi to get anywhere.
Long live the unwoke.