I don't think you are supposed to put beam racks on carbon seat posts.

Tubus Fly Rack and quickrelease adaptor, with Lone Peak front panniers. Light, plenty of space, won't damage frame, can carry up to 40 pounds.

www.thetouringstore.com

If you pack really light, you can get away with only carrying one pannier - the lopsidedness looks weird, but doesn't bother the handling.

This was my solution for a 4-day credit card tour on my titanium bike, it worked great.