Hey all. Thought I'd add my 2 cents.
Been riding my 2007 919 for 12 years. I've had the bike's suspension set up much firmer and noticeably more harsh than what I'll describe here. Had enough of the harsh, and feel my current settings for me are a great compromise between comfort and control.
Your results may vary due to: your weight, riding style, character of the roads you commonly ride, desired comfort, and bike mods if any.
For comparison purposes: my weight 165lb; I enjoy riding what I would call a mixture of quickly thru the curves and usually 5 over otherwise, not track level; my rides are usually state highways, little interstate; and, I want a ride that doesn't literally beat me up (see my Sargent seat post). The bike is stock, with its original equipment.
Spring preload: 3 lines showing, just short of the 4th line showing. 13mm of "cylinder" showing above the blue fork nut to the cylinder shoulder. This results in the *damping* marks appearing upside down when seated on the bike. This is slightly more preload or harder than stock.
Rebound Damping: The indicator dot set to the factory setting or arrow, per the owner's manual
Rear Suspension Preload: Shock spring set to the 2nd scallop, ie: the standard position.
Rear Suspension Damping: Midway between the S & H, which is slightly more or harder damping than stock.
I tried to use the same verbiage as much as possible to match what's used in the owner's manual.
Scientific? No, there are some excellent links in the forum regarding sag and other aspects of suspension setup. Check them out.
This is more a quick and dirty to hopefully get you in the neighborhood.
Good luck, and have fun out there!