Now that's a whole different story
spider ing is usually caused by over-thinning or too high pressure, when you thin your paint, you should normally reduce pressure to accommodate, I belive your brush is 0.5 , in that case lowering your pressure would cause graininess in your layers, so if you want more control or more transparency you would be better to add a transparent medium rather than reduce, this is all just trial and error till you find the happy mix that rocks your boat.
If you have any transparent Base, try mixing that fifty fifty with your paint with no thinning/reducing and see how that goes, or just try your paint neat as it comes.
As you can see yourself, your paint is being blown in all directions, this is clear indication of your pressure being to high for your mix, I would have a working pressure 5-7 psi for your mix with a 0.5 nozzle.
The short story = nothing wrong with your brush
play around with your ratios, your mix is more suited to 0.2 or less detail brush.