o0 Impressive labels work!
A few of them are overlapping though but I know it's a hell of a job you're doing at the moment.
About the white lines, they sure need some improvement. I'd advice a bit of smooth on them. Assuming you're drawing them with mouse, one tip would be to draw them with your brush zooming at 200 or 300%, this will blur the brush a very little bit ( but keeping some solid line) and make the lines smoother and less pixellated/hard round brushed