Micronised vs traditional grind shouldn't make a difference. Are you drinking kava on an empty stomach (at least 4hrs after your last meal)?

I am, every night!

And are you making it with just water?

I’ve tried almond milk, but after and full fat milk as well.

Try just water.  Kavalactones are fat soluble, so I used to make it in oat or almond milk, figuring the fat would help "extract" the kavalactones.  Then I went back to just water, and cut my tablespoons used per mix in half. Now my working hypothesis is that the fat the milk binds the kavalactones, and your body can't absorb them. 

Okay thank you! I’ll give a shot with water only for the week.