The tek I followed said I should just stop when pulls yield this little.
I followed a poorly made tek from another site and have learned my lesson - I want to try and salvage this run as much as possible though.
A pull for me consists of adding 30ml naptha, screwing the lid on and allowing it to sit in a warm water bath for a few minutes to warm up. The jar is turned end over end a few times and returned to it's water bath repeatedly over the course of 5-10min. I use a turkey baster to retrieve the naptha then freeze precipitate.
Will spice not migrate (or at least as well) from the bark powder into the basified water or not from the water into the naptha at too high a pH or something? If I have overdone it on the lye and can't work out how much vinegar to add I'll probably go with bringing it up to 4-8L of liquid in total which should make things right if this is a pH issue.
Thanks for the responses so far guys, keep 'em coming!