I typically bowl lather and am wondering how to keep your puck from sliding around the bottom of the bowl? If the bowl is a bit bigger than the puck, the puck seems to just slide all over the place as you are swirling your brush. Do I need a smaller bowl? Should I get a bowl for each puck and form the puck to the bottom of the bowl so they don't slide around? Is the answer to just buy more soaps, bowls, and mugs until I get a magical pairing that works wonderfully together?