I know you said you followed the tek to a t, but you could get better feedback if you posted step by step everything you actually did so that other members more experienced in the tek can try and see if you did in fact follow it or perhaps deviated somehow by mistake although you thought you were following it. That being said, it is highly likely that you followed the precedures correctly and just have some bunk bark. I have seen the same tek yield less than .1% with some samples and 1.5% with others. Remember, we are not making anything, only extracting it. You can never pull alkaloids out of the solution that aren't already present.
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