Ron, on your first test you sprayed solution only, then recovered it during the one and only pull stroke. On the second test you keyed while pulling - recovering as you went, then did another push and another pull, for a total of three strokes (both pushing AND pulling) after the solution was sprayed.
Of course the second test turned out better.....
It seems pretty simple to me - forward stroke tends to force the wand into the fibers, increasing recovery, while pulling the wand tends to lift it off the fibers, hurting recovery. But if you do both - as in keying during the pull stroke then pushing back to where you started it's a moot point.