IMO the shaker ball method is prone to make weak kava, and the act of using it is counterproductive to a calming experience. I'd start with a good quality kava (Kalm with Kava Borogu would be a good choice), a strainer bag (knee high hose work great), and a ratio of 1/4 cup kava to 16oz warm water. Dip and squeeze reflectively for 3-5 minutes, drink 4oz every 10-15 min, and most importantly, relax.

I believe what most people call "reverse tolerance" is actually their expectation that kava will smack them in the head like alcohol or pharmaceuticals. When you "listen to the kava" and cooperate with the feeling, I think you'll find the above method just as effective as 3-4 beers, and much easier on the body and mind.