I never understood why modern road bikes didn't have kickstands until the mechanic at my LBS told me why.

1: Ignoring the clearance issues you're experiencing, the attachment mechanism of the kickstand can deform the frame (and in the case of carbon fiber, it can outright ruin the frame).

2: In the case of an accident, there's a possibility of the kickstand skewering your calf.

3: It does add extra weight to the bike so the weight weenies complain about it.

Instead of attaching a kickstand to the bike, consider using something like this:

http://www.topeak.com/products/Stora...FlashStandSlim