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Anyone have any tips on how to paint them? Specifically i'm painting scratches - I've tried using every style and size of brush, different thicknesses of paint etc but the lines always seem to come out a little too thick. Is there some knack i'm missing of is it literally just better brush control?

A couple of basic tips you may already be aware of:

If you thin down your paint a little it will help it flow from the brush to where you are painting. Make sure you don't have too much paint on the brush (you can just sweep the excess paint onto the palette), and then roll the tip of the brush against the palette to get it to a nice point.

A long bristled, fine point brush will help. Thin paint, and even movement on the stroke with very little pressure.

Edit: For deep (double line) scratches etc, paint the high contrast line first (usually the highlight), then do the shade line above it.

(Brush) Size does not matter much.
Get a good brush with a fine point. A good size 2 or 4 brush can have a better point than a cheap zero. And practice.

A lot of good advice, another trick: Before you want to do your lines, spend a few minutes writing your signature with your brush. Your body does that without thinking, and getting it in to a more relaxed mode with the brush may help you getting the thinner lines youre looking for.

If you can find the right color, consider micra pens. I use one for scribbles on scrolls, etc.

just adding my two cents

what I've seen that works for me is to use the flow improvers and actual acrylic thinners for this sort of thing (don't rely on water, it can have too many impurities...something, whatever, it's too inconsistent in this case imo). Also, to reiterate, a good brush. You really need a good sable brush. Not necessarily the very best sable, but a nice one, it helps a ton with control. The last thing I noticed helps me: using the actual tip very very gently. Barely touching the surface, even if I take a couple extra passes before I actually touch it "hard" enough to leave paint. This helps me not push down so hard that I leave a quite large line. Anyway, YMMV etc

For thin lines, I've always found it easiest to paint the line first (usually far too thick)... and then thin it down with the background color.

Like if you're painting a scratch on an Ultramarine's armor, you paint the silver first in the scratch, THEN get the blues out and paint the surface of the armor, using the blue to 'thin down' the silver line.