Not trying to hijack.... but
What does you bike do when it has too much sag in the front and/or the rear or not enough sag.
What does too much/little compression effect
What does too much/little rebound effect
I guess sag it set by preload?
Sag is set by preload. To little sag and the bike wont respond fast enough, kinda sluggish if you will. To stiff and it beats the hell out of you and could bounce the bike off the ground.
Compression is basicly traction and soaking up the bumps. To soft it will bottom out on big bumps and too stiff will bounce you out of the seat and limit traction.
Rebound is how fast the suspention recovers from a bump. To slow and the tire wont go down to grab the road fast enough. The bike will sit low after bumps also. To fast and the bike will bounce up after a bump and feel springy. You want to error on the soft side of rebound.
Start with the settings in the book (mine was not set to these) and go from there. You just have to play with them to feel whats going on. Your not gonna mess your bike up by playing with the settings unless you do somthing stupid like full soft rebound with full hard compression. You will be able to feel a couple of clicks on the adjustments. Do two clicks at a time till you fine what you like.
Hope this helps.
DK