so I have one of the old Smith boyscout sharpening stones. one of the old 2X4 gray/blue ones. no clue what the grit is on it, but if it's equivalent to their current offering its a medium (soft) Arkansas stone. My question is this, I'm not getting that hair shaving sharpness i'm looking for on my knives. What style/grit stone should I get for that razor sharp cut i'm looking for?