The aero color works in airbrushes with a nozzle size bigger than 0.2 mm. Normally you don't need to dilute them at all... Createx yes you need to reduce it a bit, and it comes with an alcohol based reduced from createx. Gold, silvers and other similar effect colors are much thicker, so maybe you need to reduce them a bit.
You can reduce with water, but use distilled water or bottled, not from the tab. And you reduce only adding a drop or two max.
Increase the pressure of the compressor (I use 25 to 30 psi normally) and use a wet cotton bud to clean the tip frequently (but with care not to bend it)
If you want to make normal acrylics usable for airbrush, see my post on mixing acrylics