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Running into issues with GW paint through the airbrush. Looking for advice on how to properly thin my paints.

I'm painting a Sons of Horus army and running into issues with 3 specific paints, used through the airbrush:

- Incubi Darkness
- Kabalite Green
- Sybarite Green

To thin them, I've been using different combinations of the following:

- Water
- Liquitex Flow Aid
- Liquitex Airbrush Medium
- Liquitex Slow Dry
- Lahmian Medium

So far, I haven't hit on the magic combination that makes these paints want to flow. Problems have broken down into 2 categories:

- It's too thin, and it takes a lot of layers (5+) to build up to a decent color. It leaves me with uneven patches, spiders, and occasionally with a watery mix that runs down into crevasses.

- It's a decent thickness and starts giving me problems in the middle of a paint job. More air is suddenly needed to push paint out the tip and higher PSI is needed to get it to move. I end up having to disassemble the airbrush and clean the tip in isopropyl alcohol before I can use it again.

In most cases, the paints work well for a short time before problems start to appear. It occurred to me I might not be properly mixing the paints in the cup and I've been very careful about measuring the thinning mix.

This isn't a problem with technique or equipment, my airbrushes are kept clean and other paints (Vallejo, Minitaire) work fine. When I start mixing in other paints - like Minitaire Snow White, to do highlights - the problems seem to go away. To compensate for the problems, I've been working with small batches of paint and thoroughly cleaning the airbrush every 15 minutes or so to avoid dry tip.

But this is getting tedious and taking more time than it should, so now I'm looking for a better way. Anyone have advice on thinning the paint?