I would be concerned that adding lead might result in a version of a pasted strop, something I have tried to avoid. The lather, any kind I was using at the time, has seemed to work wonders for me. I lather the soap on heavy, leave it out overnight to dry (and to allow the strop to absorb the lather), and rub it in the next day. I have experienced build-up of soap and dye from the strop on the blade, but it is easily wiped off. The increase in draw is significant, turning my paddle into a "draw machine".