All Right!!
I get to use all my motocross experience to explain something on a 'Busa Board!! Whoo Hoo!!
Ok, at the bottom of your shock mount is a set of "dogbones"
It's a rising rate leverage system. The rate of "spring" changes as the shock compresses and the rear swingarm travels upward. This is how the same spring can feel soft and cushy on small stuff, but firm on big holes and bumps at speed.
It (dogbones) doesn't only change the ride height, it changes the progressiveness in the spring action...changing how and the feel of the shock itself.
Something you can try, with a lesser degree of effect, is to wotrk on what is referred to as "race sag" That is by tightening or loosening the shock collar.
Get a buddy (or two) and a tape measure to do this...Have your buddy lift up on the rear tail of the bike and take a measurement from the rear axle to a stationary point, say a seat bolt. write that measurement down.
Then, with the bike on the ground, have someone hold the bike up and have you standing on the pegs (not sitting) do the same measurement (Don't lift rear tail).
Write that down and calculate the difference.
By turning that shock collar, you can adjust the ride height, but keep in mind, it also alters the handling somewhat.
Keep track of the different measurements until you find a spot (number) you like...then you can always go back to that number...once you get really good at it, you can learn to change the measurement (number) for different tracks and twisties for better handling