I find that a much harder tomonagura can work well if your patient enough to prep the tomo. Rounding a corner with a dia plate and using it with light pressure will raise that finer slurry. Or use the dn slurry and break it first with another blade of knife to get it finer before you use the blade your working on. Or use slurry from a prefinisher on your finisher. The work is done on that and the finer finishing stone will max out the edge imo. I think we have to be creative. None of these ideas we have are original.