I bought a 2012 Scale. I loved the ride but the carbon dropouts are not strong enough to hold the rear wheel. The rear wheel continuously came loose eventually ovalizing the dropout and the wheel would no longer sit straight. If you google it, you can find many instances of the same problem.
Scott agreed to a partial warranty and got me a 2013 for $300. Same problem with this one. I am thinking about contacting Calfe and see if they can cut out the dropouts and replace with some alloy ones. I would not buy another one unless they address the problem.
Sorry I strayed from the topic.
well under 1000g for a medium frame.
I am thinking of getting a Cannondale Flash myself.
I have a Scott Scale 2012 and have no problems whatsoever with my rear wheel and I am 80 kg. Did you ever try a other wheel? I have had the same problem with a Cannondale Caad 4 frame. My Cannondale dealer first tried a other wheel and that was the same. I even went to a framebuilder to ask if he could help me. At the end the problem was the Coda hub, my dealer used a wheel with the same hub to try. I changed to a Mavic wheel and the problem was solved. I suggest you try a other wheel and then a other quickrelease.
BTW I realy love my Scale, great bike!