I bought the 20mm bar risers from Twisted Throttle and they are aces. I believe they are also available through Touratech. While I didn't suffer from pain with the stock setup, the riding position was off for me. The risers did the trick.
'06 Goodwood Green and '05 Black Bonnies
2011 Tiger 800/ 1995 Daytona Super III
2004 Daytona 650/2013 Honda CB1100
1989 Honda GB500/1968 Norton P11 Ranger
1961 Moto Morini Tresette 175