I have reset all the front shock adjusters counter clockwise and the front of the bike bounces easy.
Adjusting only the bottom shock adjuster to the right (clockwise) makes the bike easy to compress but slow to return...in my book that means the bottom adjuster affects rebound or extension. There appears to be 8 clicks on the bottom adjuster (if I heard and counted properly

)
Adjusting only the top shock adjuster clockwise makes the bike harder to push down, in my book that means the top adjuster affects bump or compression. There seems to be 13 clicks on the top adjuster.
For the purposes of testing it all, I have left the top set to maximum anti clockwise (soft) and I have been playing with the bottom adjuster, one click at a time. My observation so far is it rides the bumps really well but transfers weight quickly under braking and acceleration. On one click the front still rises quickly under acceleration but not as quickly as on zero....lifts the front a bit like a drag car.
Just for a joke I rode it at front and back full soft, then front and back full hard.

The thing went from nice comfortable ride to brick.....just about knocks the wind out of you on full hard
On maximum soft on the lower adjuster, the front of the bike came up quickly. One click clockwise reduced this. Is on two clicks ATM. I expect that on acceleration it will not lift the front as quickly.
My understanding is the preload adjuster on the ZX7R and ZXR750 doesn't actually change the preload but just the height (although it's the same thing until the fork is topped out but that statement causes arguements....

). The guy at promecha showed me on the ZXR750 fronts and I imagine that ZX7R front adjusters do the same??. It just screws the body up and down. If you were to take the load off the front and let the wheel hang in full droop, then mark the chrome section with a soft felt marker, and then screw the adjuster up or down...the mark will move towards or away from the fork tube.