Just had EXACTLY the same issue on my Dolce. The LBS ordered some special shims, and when she took them to the mechanic to put on, he showed her how to adjust WITHOUT SHIMS! I don't have my camera right now, but if you on your bike and look at the levers, there is a small hole in the black plastic part. There is a screw like thingy inside that you turn with a screwdriver?( I didn't adjust them the LBS did) and it creates it's own shim.

The Sora's are the only ones like this according to the mechanic.

Hope this helps!