I've recently obtained 15x Thai Extract from a reputable vendor. I know that most people make a tea with the leaf but since it doesn't take near as much extract I decided to parachute it in several bundles to avoid the bitter taste. I did this with 1g, then 2 g on a different occasion. I don't feel that it had as much effect as other trip reports i've read on Erowid. Do you think that the tea making process activates some of the alkaloids that aren't active orally? I've read that chewing the fresh leaves produces significant effects so I wouldn't think so but I just want to make sure that I'm not wasting product and maybe just need a slightly larger dose.
If you check google, you'll see the internet is rife with people claiming 15x, and specifically the 15x, is shit. For some reason 15x kratom is really only 3x. 10x is 10x, 20x is 20x, but 15x = 3x. I don't know why, or if it's vendor specific, or what. Your story is entirely consistent with what I came across when researching this plant however. Avoid 15x. Get either the tinctures or leaf. I got powerful opiate effects from 8g. Felt like ~200mg codeine.
