When you say "brushing", are you airbrushing or brushing by hand?
I second Momo's question about what you're using to thin the Tamiya X-22. I'll include in that question any other Tamiya acrylic colors you're using.
I use Tamiya's acrylics all the time, and apply them by hand as well as airbrushing. I get my best results using Tamiya's proprietary thinner for their acrylics. I know others may use other solutions, like isopropyl, but none of the others worked as well for me, as Tamiya's proprietary thinner. The only exception is using lacquer thinner for airbrushing Tamiya acrylic paints. That thins the paint well, and it enhances the matte finish of matte colors, but not enough for me to use in place of Tamiya's own thinner.
The picture you posted of your Mosquito reminds me of how Tamiya's acrylics worked for me when brushing by hand and before I learned to thin the paint. Before that, I'd lay down one coat, let it dry, then try to apply a second coat. I found that often, the second coat would pull up the first coat. The effect varied from color to color, which I put down to the chemical composition of the pigments. Black and white were the worst colors for this. When I started airbrushing regularly, I always thinned the Tamiya acrylics, and that's when it hit me to do it for hand-brushing.
