I don't think I've posted before, but I figured out a way to get the exact RPM count on the DLX, and I thought some of you might be interested. I put a little sticky note on the side of the bowl, and took video at the three lowest speeds. Next I played them back in slow motion, and counted turns with the second timer.
The very lowest setting turned out to be 60 rpms, where the second line starts was 120 rpms, and where the third line starts was 180 rpms. Of course, this was under no load, but at least it gives a benchmark.