For most of the '80's we used Advance's Swiss Yellow, 60 mesh, because of all the 60 meshes, it had the thinnest thread, 123 microns (why I remember that when I'm not sure what I had for dinner last night, I don't know) and always coated with the thin edge; one develops the proper speed and pressure after a few, and no more than 2 screens without topping off the coater...
Steve