Has anybody had any luck getting good touch up results with Magnetic Grey?

I have two fine line surface scratches in the passenger side rear fender that are just into the paint but not past the primer or into the sheet metal. They are not deep, and look like fine white lines in the paint about 2-3" long. They are the result of bicycle handle bars. They don't buff out.

Using the touch up paint, even with the pen, is hard to get a good result with this color. It seems as though the repair is always more visible than the original scratch!

I took it to a body shop and they were able to smooth it out a little with a very fine abrasive and get a little better result with the touch up, but the scratch is still readily visible. Professionally repairing by painting the panel and blending into other panels, etc. seems like overkill and would cost hundreds of dollars.

Seems like other colors like white or tan or red or black would be so much easier. The grey with the metallic makes any flaw really stand out.