I kneaded it for about 10 minutes, yes. It's been 5 hours since i tested it, i felt very relaxed for most of that time, a little bit sleepy too. I like it and if what they say about reverse tolerance is true, i am looking forward to trying it again the next days. I am gonna try your method today. But i lost you somewhere along your description. Every time i add the 6 new grams, i do that with new water too, correct? So in essence, i would have 3-4 dosages. And i guess i could use them not all at the same day, but spread them throughout 2-3 days. Answering to your question, i would say i experienced a very slight numbness in my tongue.
Yes, new water each time.
To really get the value of your kava (especially given how much we pay for it) you can do multiple washes but then, as the potency diminishes with each wash, you either have to use less water each time or add a little new kava each time. The less water (without adding any additional root) approach only really works if you start from a very large quantity so that the amount in your final wash is a non-trivial amount. So to end up with a final wash in 300 ml of water, say in your 4th or 5th wash, you would start with about 125g in 2L of water, then probably 1.5L for the second wash, 1L for the third and 0.5L for the fourth. Or something like that. But if you are starting with smaller quantities of medium grind, then you really need to add small amounts of powder so that you can keep the volume of each wash the same, here 250ml or 300ml, and the potency roughly the same.
It does look like the stuff you got really is kava and the quality seems acceptable, so that is good news, indeed. I know that was a concern.
Glad you enjoyed it. Looks like you aren't overly burdened with the annoyance of RT, which is also fortunate.
Hope your next grog is even better. Cheers.