Okay so, I saw your last comment and I wanted to help a little?
Okay number one, I don't think your highlights are sloppy at all in fact its pretty spot on!
I think the problem may be with how bright your highlights may be-
I suggest toning down the highlights a little?
from my experience with small pixels like that I find that the colors don't have to be so drastically changed as so-
I think if you tone down your highlights a little it'll help give a better more blended sorta look and not look so noisy?

I did a quick edit to show-
I honestly hope my advice will help you uvu;