The Campy stuff on my Kona wasn't making it - the gearing didn't have enough range (or maybe just not the right range) for the flatlands so I made the following changes:
Swapped the Campy drivetrain for Shimano XTR "rapidrise" with a compact double crank
Went to bar-end friction shifters
Added the Brooks B-17
May do some more fiddling this fall. The rear brake seems absolutely useless - I've never needed it. Also, the front double seems useless - I never ride but on one chainring.