Carbon paste primarily does two things: it provides that little bit of grit to help prevent slippage for parts like carbon seatposts and handlebars. And it acts as a barrier to keep certain parts from fusing to other parts--especially true of seatposts, which, under the right conditions (repeated exposure to water seeping past the seat collar) over a long enough time, can fuse to the inside of a frame's seat tube. There isn't much about the V20c's design that invites carbon fusing, nor are there really any spots where slippage might be a concern. Put a light coating of regular grease on the bb shell threads, pedal spindle threads, and where the headset bearings contact bearing cups and races. Otherwise, keep the clamping areas dry and follow the torque specs with an accurate torque wrench. With the bb shell clamp, make sure that the four bolt gaps between the two halves of the clamp are even. Be careful not to over torque the two pinch bolts underneath the boom. And make sure to apply full torque to the slider clamp above the headset so that it doesn't slide when you put down big power. The only spot where I applied carbon paste was inside the handlebar clamp on the slider, and I probably did that more out of habit than anything else.
Happy building!