To prevent those dents just use less lube. The inside of the neck needs a little lube - rotate a wire or nylon brush on your lube pad and push it in and out of your necks a few times. Don't put any lube on the shoulder of the case and the lube that spills on to the outside of the neck when you lube the inside should be enough fo that area. Roll a little lube onto the body of the case and size.
You may have to clean some of that oil out of your die - just use some light cotton cloth to wipe out the excess.