So what's your theory Tim
Why did the Hruby remove more soil?
Does the machine have a soul?
My thought is the actual speed plays a huge factor in soil removal. How? On a 3/8 orbit, the rotation is slower, even though the orbit still oscillates at 1725 or so. This allows the pad to dig in a little deeper and actually absorb soil more efficiently. A downfall is the 3/8 oscillation doesnt travel past the fiber before returning, and does pose a risk to tip bloom.
On larger orbit machines, the offset forces the driver to spin twice as fast, and the added 1/4 inch of orbit forces the pad past the individual fiber before returning, never really digging in at all. The only benefit to this is the reduced chance of tip blooming. As Lee stated, the manufacture realized the reduction of soil removal and decided to attempt to be a direct competitor for high production machines such as a cimex.........Which is, and should never be a stand alone process unless vacuuming is done often,...........and correctly, ( and that is rarely the case)
Nothing wrong with this type of cleaning or the machine. For what it is, and for the educated on what it truly does, it does great, but it isnt by any means a type of pad extracting op machine.
But to answer your question, Naw, it doesnt have a soul..............but the operator should have a conscious on where it can and should be used.