Thanks mck .Did not check how the spinner was seated. I am confident that i'm reading and using the bat gauge correct and am getting square edges. With the 100/50 it was the bottom edge that was getting much sharper with a visibly deeper hollow toward that edge. To test the spinner I flipped it around, redressed the wheel, changed height on side knobs of holder to rematch where spinner dressed wheel and ended up with the same hollow just opposite (top edge super sharp).With the spinner in with the numbers up the flat dresses the wheel slightly lower than center of the stone.