Hi Mark
Actually you are right, some cartridges work, some not, it is a mystery. But problem is that heads on HP have two channels. For example Magenta work on my printer but yellow not. I replace both of them with refillable cartridges. Those two inks use same head therefore I replaced them both in order to equalize pressure in printhead. Never the less, my first problem started with yellow, which become darker, than become orange, and finally red – so conclusion is that magenta ink somehow get into the yellow part of printhead.
I replaced that printhead with new one, and suddenly yellow ink is completely missing. I put back original ink cartridges, and it started to work flawlessly.
I got similar problem with Light cyan Light magenta – LM is working, LC shows only traces of ink – both of them refillable cartridges, with original ink cartridges both channels deliver ink without the problem. Also with combination of Gloss Enhancer – Gray, where gray area of print show severe banding.