Hi Alex!
First of all, I am really impressed by the level of detail you get into these tiny models! You building is fantastic!
If I may offer a suggestion for your painting, I think I saw somewhere here that you are using Tamiya paints. Tamiya and Gunze paints are really designed to be airbrushed which makes brush painting with them difficult. It can be done and done well as many modelers have shown, I personally have always had issues.
I have been trying to slowly shift my paint supplies away from enamels in the last year or so, my wife doesn't appreciate the smell and there are the associated potential heath risks, so I have been experimenting quite a bit with different brands. I would recommend giving Lifecolor paints a try. They are a full on water based acrylic. They are non-toxic and don't have any obnoxious smell. They are very easy to brush paint and shrink a bit as they dry which helps keep them from gumming up tiny details. They also cover very well in a single coat and don't generally leave brush marks although I recommend a second coat for durability. Also they are easily thinned with plain old water. As alternatives Vellajo Acylics are pretty much made exclusively for brush painting (originally targeted at figure modelers) and the Ammo by Mig paints are very easy to use with a brush as well. Apparently Mr. Jimenez wanted them to work well with a brush or through an airbrush.
Hopefully this helps, it might be as easy as just switching up your preferred brand of paints. Don't get discouraged my friend, remember this is a hobby (as Christian keeps reminding me :woohoo: ) meant as a means of relaxing and should certainly not add stress to our lives. We get better with every kit we build, even if we aren't exactly happy with that particular end result. And like I said above, I love watching your builds because of all those tiny details that you cram into these 72nd scale kits, I am amazed an awed by it. Those are skills I will never process!
Keep at it my friend!
Mike