Hi - I work for TRP Brakes and can say that by and large the problem is one of set up, not the brakes. The short answer is that you probably need to center the brake arms via the two adjustment screws (one on each arm) to eliminate the rubbing. You should also check the mount for any drag when the brake is mounted, but not secured to the brake cable - does it move freely? Is tension spring in the middle position? Are there kinks in the system or is it overly long (eg I'd say that Mr Demerly is running a bit too much cable housing which may slow brake response and return rate). Set up is, as mentioned, very important. We have yet to run across any issues with brake performance when they are properly set up and maintained.
You can see the set up article here:
http://trpbrakes.com/...le_detail.php?aid=14 - my apologies for the spacing and layout issues...we'll have that fixed by friday. We do have a set up guide for the QR CD0.1 specifically..but that is mostly for the front brake which has two sets of adjustment screws.
If you have additional questions give me a call - 1.877.807.4162 and we can talk through it (much easier than trying to infer an issue online!)
All the best,
Matt McNamara
TRP Brakes