So, Saturday, as I posted above, I got PR4 GTs mounted. Sunday, I finally got enough people around to set the sag on the new fork springs and new Penske. Monday, I got a chance to put on a couple of hundred miles. What a difference. This has become one incredible bike. Straight line stability, agility, suspension that's compliant, yet can handle two up as well. Wow. The suspension and tires represent a considerable investment, but it was money well spent.
I think I need to ride again, today - just to make sure that my initial impression was accurate.