Do you think it could be because if he micronized? Would it be better to go instant? Also do you know I GHK would swap out for it?
Not sure if you'd have a different reaction with instant or not. It may give you less squirts, as you so delicately put it.
But its hard to say. Honestly I'd say get the extract from Kava Kava R Us (70% kavalactones), and hammer on that until you break RT, just my personal opinion. Then try a couple strains of medium grind which would be easier on your stomach and GI tract.
Not sure about GHK doing exchanges/refunds. I know he guarantees satisfaction, and I've seen him do that before when the bag is broken or something like that, but I'm sure it gets determined on an individual basis, so you'd just have to ask him about it I guess. He's always good about responding, I'd say just shoot him an email.
Good luck man. I do hope you get a chance to experience kava for real, it just sounds like you're one of the ones with a tough RT period... Like I said mine was about 2 weeks, when I broke through, I really felt it... But that's subjective too, it's not like being "high" or drunk or anything like that, it's a sensation unto itself. I guess it depends on what your expectations are...