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It's not the best photo but I don't see anything wrong, it looks great. With original scales and preserved etch, you can't be too critical either.

Whether it's a penetrating crack or the edge of a layer lifting off, doing what Rezdog suggests is the best course of action. Very gentle scraping will remove some of the dirt darkening the edge and...

Steel wool grades.

I worked an etching recently and used diamond lapping film and a cork.

If the 220 you mention is sandpaper, then it is waaaay to harsh for your purposes.

Even with polish there will be some softening of the edges on the etch if you over do it.
I have found Blue Magic gentler than Mothers as well.