FWIW, the two side by side owls I uploaded were printed using acceleration at 120mm/s and 0.1mm layer height. Each took about two hours forty-four minutes to print. The owl on the left used default SF50 settings, including perimeter slowdown of 50% and 1.0 mm retraction (reversal). The one on the right also used default SF50 settings BUT then perimeter slowdown and retraction were disabled and altshell and firmware deprime were instead used. Both came out quite nice.