Ok just some thoughts, DLC is usually a flat finish just like hard chrome unless the metal is polished before finishing. I would say the ejector was tuned but ejection will be different with different ammo, you problem is easily fixed. I am sure they will tune it for you. The tooless guiderod is a matter of preference, personally I dont really care for it.
I do not own a CK but they seem to be decent guns, I think once you reach 3k price you need to just have a custom built and that way yoi get it the way you want it.