Shoot steel or aluminum shelled cartridges no brass marks
Sorry, I don't think there's anything you can do about that. Playing with the ejector (when pistols function is fine) might be inviting trouble. Have a Glock that does the same thing, and don't worry about it anymore.
There are ways to slow the slide speed or alter the ejection angle with the extractor and ejector, but I have to agree with sikhed, unless it really bothers you, don't worry about it.
On my H&K USP Custom Sport I get the same marks.
I use Milfoam to remove it http://www.milfoam.fi/flash/index.html (Takes less then 2 minutes)
Im waiting for a SA Mil-Spec Parkerized and I guess it will work on that to.
There actually are ways to remove the marks without damaging the existing finish. Get a "copper solvent" cleaner and take a small patch and saturate it. Place that small patch over the ding marks on the slide and leave it on there for a few hours (or overnight). The marks will be gone. You can slightly speed up the process by using heat. I have a bench light over my cleaning bench and place the light about 8" from the slide when I do this.
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