I have never been able to get center pulls to feel good to me, even when I worked at a shop and could get new parts.... the Rene Herse are quite nice but there is NWIH I will be parting with that much cash for brakes. ! And they don't include nuts and bolts! I am in the wrong business, lol.
Maybe if I ever find a dumpster pair of Mafac's I can work on them and try again but in the meantime I will live with these and get some singles to work. Maybe I will take these apart and work on the fit to get the chatter out of them.