Then there are guys like me who prefer +2 rear only so the change is not too aggressive and it shortens the wheelbase to help with turn-in slightly. Plus the rear sprocket is much easier to change. This is essentially the same as going -1F, but with the advantages I just mention.
You are right about the top speeds being academic and its the riding conditions at that very moment which define where you will max out at.
Just curious about two things since you mentioned you run a +2R. How is the difference in acceleration vs stock? Brutal enough to want to keep the front itchy to pop in the initial gears all the time?
Any idea how much top end you have lost with the +2 realistically?