The answer to your problems is here
I'd been riding shimano drivetrains on both road and mtb bikes for a few years and fancied seeing what the dark/light side was like (i.e. Campagnolo).
I didn't want to spend a lot of money converting the whole drivetrain, only to find out I prefered Shimano so I bought a pair of used Chorus 9-speed ergolevers off e-bay and the Jtek No.3 which converts the cable pull from the 9-speed Campag ergolevers to the 9-speed Shimano rear mech & cassette.
I used a new gear cable as recommended and found some skipping while the cable stretched-in, but once adjusted it worked really well.
I'd definitely recommend the Jtek solution because it lets you sample the Campag style of shifting for a relatively small outlay.