One thing I've found with thicker pigments, is that I have to run my machines slower. If you are not having problems with thinner inks, only the thick ones, either dilute the thick ink with a drop of distilled water or witch hazel into the ink cap so that everything is uniform, or slow your machine down to accommodate the thick ink.
I think it was Specialtechnique and/or rjdaddio that posted an interesting response to a thread about Dragonfly machines spitting ink out the tube because of people running them too fast and it almost building up somewhat of a vacuum which made the ink travel up the needle...
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