6 heaped teaspoons, another night on the Kava quest
Good luck.
Remember to keep this in mind...some people have a naturally low tolerance to kava and get full effects off of small doses, while others have a much higher tolerance and require double or triple the amount to have notable effects.
Given you're attempts, I think it's safe to say you are a natural born hard-head and playing it safe with small doses won't get you where you want to be. 6 TEAspoons is still only equal to 2 TABLEspoons...2 TABLEspoons would only be a starter for me and many others, including the majority of Vanuatu.
If you mix 6 Teaspoons, chug half of it, wait 30 minutes chug the other half and still feel like you can have more, by all means mix up another 6Teaspoons and do it again...that's how you'll find out if you simply aren't consuming enough.
I typically drink 12-16 TEAspoons (4 or 5 Tablespoons) of instant or micro over the course of the night.
That amount is roughly equal to strength/amount you would drink anywhere and by anyone in Vanuatu.