Then I would take them to 95% - perhaps 1000 grit. Most quality Heat Treaters these days will send them back nearly as shiny as you sent them, with little more than some blue oxides that should clean off on the buffer. Excetions would be anything oil quenched, and very thin (1/16) or long and somewhat thin (12"+ 3/32 fillet knives) that can be prone to warping. Those are often best ground after HT.