The missing link.
You've got a carbon frame, a carbon fork, a carbon seatpost, and a carbon bar. Hell, even your cages and pedal bodies are carbon. It's time to complete the unidirectional, high-modulus chain with the missing link: Easton's EC70 SL Stem. It's not as light as the only-weight-matters EC90 SL model, but its claimed weight of 140g still puts it in competition with most lightweight stems while relegating the bulkier "aero" models to the overweight bin.