That last one is awesome…
You mentioned brightness issues, which made me think of something. Are your running this in 4.15? Just curious, because if you are fine tuning colors and brightness, you’ll probably want to hop into 4.15 to make sure it looks good against the default tonemapper. Sure, you can set the filmic tonemapper off, but I personally feel it looks good and it’s better to work with it, than against it 
Anyhow, looking good, keep it up!