Thanks everyone.

As an added data point, my husband (with large strong hands) has tried it and said that although he can shift, it is tougher to shift than any of his bikes. I'm not really comfortable taking the shim out, because I think I would rather be able to reach the brakes. I think I need to try the R700s, but I'm a little hesitant to spend the money if it doesn't work. I have another LBS that I like that I'm due for a trip to to buy some new gloves...I may ask them if they've encountered this before.

aeiea, I do a fair bit of shifting because I live in a hilly area. I'm rather hung up on this even though I think that most of my riding will be in the middle chainring because I just spent a good amount of money on this bike and I want to be able to use it properly!

I'd be grateful for any other suggestions!