Keep the non-dominant hand, or one finger really, on the top of the spine, if in need of more control. I will do it when honing short kamisoris, and only sometimes. So not on the side of the razor in the spine area, but on the actual top of the spine, and it is likely your finger will be touching the stone. That way I'm not applying any bad pressure, just making sure the toe doesn't lift off of the hone. Or maybe it's psychological.... can't say why, but it works.