I've no experience with those particular paints, but most paints do require some thinning, even when they claim to be airbrush ready. Seems to me that, across various brands, only yellow paints are thin enough already. It should be no thicker than whole milk in consistency, but i usually aim for more like semi-skimmed. Are you sure your nozzle is completely clean too?
Also, for fine lines and detail work you can drop your pressure down to 15-20psi and it will help you get a bit more control.
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TLR 22
B44.2
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