I also use a carbon fork with carbon steerer, aluminum stem, and carbon bars. I noticed khuon's setup uses a stem with a two-bolt faceplate. Personally, I feel safer using a stem with a four-bolt faceplate to distribute the clamping force on the carbon bar. I also recommend a torque wrench when clamping anything to a carbon component. Note that many components have different recommended torques for clamping to carbon and non-carbon parts (for example, the recommended torque for my stem bolts is lower for carbon steerer or bar). I had one near-disaster before I realized that when I overtighted a front derailleur on a carbon frame.