Ah, I took a second go at it today and lapped the proper side of them. Took about an hour to do all four which included lapping each twice and then putting a slight angle on the very edge of each corner. Helps when you lap the proper side, my D8C is pretty worn out from lapping the glass side of them I worked up a bit of a sweat in the process too lol ... thought something was wrong with that. My DMT now has a bald spot near one of the ends. Guess at least it's broken in now for any future use on it taking out a large chip.