You will get a lot of answers here when you ask a "preference" question because we all use our bikes differently.
So I will start off by saying that I classify myself as a boulevard cruiser, I dont race, drag or otherwise, and I only care about being able to ride two up and not kill myself by bottoming out on a bridge. Flame away all you racers..
So with that being said, in the front I opted for heavier oil and upgraded valves and springs. I would so totally cut the spacer down so I dont have to slide my fork tubes up, and will do that next time the forks are apart.
As far as trac telling you thats for racing, again we go back to preference and opinion... In my opinion the front susp is crucial for turning and stopping so you cant neglect it especially when the bike is set up for stock height with a 170lb rider. So you have to make your own educated decision here, which is why I am sharing these details with you.
In the rear I have the spring above and tiger tail from Guy at tiger racing. The tiger tail lets me go as low as I want with out worrying about an udertail rubbing.
I aslo ditched the front tray under the nose so I can clear the fender.
With this I ride roughly 2-2.5 inch drop, with me being 6'5 290(ish) + passenger and not having any issues with turning or long rides.
With you going out 9 inches, you may want the longer tiger tail or an extended tail (all preference) but you will not be able to slam the bike with the stock tail because the tail light will be right over the tire... 4-6 has been the best for tucking the tire in the stock tail.
So you may need to ride a little higher in the rear even if you get the shock, but with out the shock upgrade be very careful not to rip the whole light assembly off.
on my wish list is a sidewinder so that I can go lower by getting the header off to the side instead of under the bike.