It's difficult to suggest much, as it unfortunately sounds like it's simply a case of "practice, practice, practice", which I'm sure is the last thing you want to hear at this moment. After you've been painting for long enough, things like judging paint consistency become kind of second nature. You can (and probably should) always test how the paint is flowing from your brush - I often have various hues of paint plastering my left thumb (the thumb of my model holding hand) from repeatedly making sure the paint is flowing correctly with a test stroke or two (ooh-err missus!).
With regards to things like uneven lines for highlights, there are various things you can make sure you're doing: make sure your hands/arms are braced (often this means they're touching each other); make sure you move the model so your paintbrush hand is in a natural position, rather than keeping the model static and moving your painting hand around it; use a magnifier to see the areas you're highlighting more clearly; highlight with the edge of the brush, rather than the point, wherever possible (sometimes, of course, you have to use the point, and that's where having your hands braced is really important again).
In general, and particularly with highlighting, you need very little paint on your brush. It's always better to have less paint going onto your mini than you need rather than more, simply because you can add more paint, but you can't take it away - or at least it's very difficult/time consuming to take it away.
Other than these very generic pieces of advice, I'm not sure what to suggest. Maybe someone else on here has better insights than me?
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