It’s hard to judge any airbrush by white. The pigment used tends to be larger than say a red, so it clogs more frequently.
If you have some primed models, after you’ve cleaned your brush use the paints you have rather than a primer. As someone else said, there’s an additive in the paint to make it a ‘primer’ and that has a tendency to stick tight to the insides of my brush.
Listen. Well done. Just because it’s simple, doesn’t mean it’s easy.
Now go and put away your laundry. /s