Mark Hennebury
David, although supersurfacers are great, they are still a little fussy to get close to perfect, its a bit of a challenge.

There are several variables that all must work together to get the best result. With each species of wood that varies; Not only perfectly sharpened blades and precision back-knife setting, you also have the best mouth opening, the nose-bar height, shear angle and feed down-force pressure, its a bit of a ballet to organize if you are searching for absolute.

All of the geometry is required to be very precise.
The knives on the "small" machines are 13" long, back-knife setback is a couple of thou, Your shavings are only a couple of thou thick so your margin of error is slim before you will adversely effect finish to some degree.

Take the nose-bar height above the table for example.
Nose-bar height 0.02mm or 0.0007874016"