I was told before I started honing on the convex stone to use blade only pressure. I do not know why the mineral oil works better then the mix but it does. As for the convex working faster, I refer this to Jarrod. I've experimented using different numbers of laps and found 20-25 a good starting number. I no longer use Crox because the convex stone gives me a high polish and very smooth shave edge. As far as finding the blade stays flatter on the convex, could be my old hands just take to it. Keep in mind, the actual amount of convexity if there is such a word is minimal. Best way to see it is with a steel ruler laid on the stone. I do not argue that the stones are different, thats why I have so many. If I find a stone that really makes a difference, I feel obligated to pass it along. As a former engineer, sometimes you find something that doesn't make sense but works. As the saying goes, try it you'll like it.