I'm no suspension guru & no racer but at the Hawes do last summer, I was on the "progressive" rideout which consisted of myself & Jim Bryan. I found that I was struggling to set up & hold a good line around the bumpy lanes of N. Yorks. In my defence I still had all my luggage in the panniers and was on TKC's while Jim had alloys with BT010's & Ohlins. However, I found that winding off the rear preload made the bike handle MUCH better. In the end I had just a small amount of preload but the damping was about midway (I'm 72kgs) and had no probs keeping up. Several VFR owners, a Triumph 955 & a CBR6 owner were witnesses to the fun we had. Since then, I use the min preload I can get away with but make sure that the damping is enough to prevent wallowing. Works well for me.
I suppose it will depend upon the type of roads you mainly use, and how you ride. I like twisty, bumpy roads rather than fast sweepers so my bike is set up to suit these.