The pre-2011 Evos are known for the behaviour described by gazzaecowarrior. Adding risers even makes this phenomenon worse. Beta has realised this. In an effort to shift the centre of gravity forward, they have not only shifted the engine, but lowered the handlebar receivers by 1 cm on the 2011 model range.
I have long hesitated whether to buy a used 2010 or a new 2012 and having learned from your postings, I am going to go for the 2012 Evo with the 1 inch handlebar risers I have found on ebay
http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=180725672016
I came across this forum quite by accident, but am glad to have learned from you guys.