So, we know that slowing down printing speed causes less vibration and the horizontal surface quality becomes brilliant !
But I don't want to do my Whole print at that slow speed of 20mm/s as it takes days.
Is it possible to just set the Top Solid Layers to 20mms ... and the rest of the models Bottom Solid Layers, Infill, Support, Outline/Perimeter Shells to 80mm/s ?
A bit like building the pyramids ... use rough blocks for the base and infill, then smoother finer layers for the coating (in this case horizontal layers)