I was going to say it in my previous post but didn't want to sound like a smart alec but a lot of people misunderstand what a truss rod is for. It's sole purpose is for setting neck relief. It does indirectly impact action but should never be used for that purpose. Neck relief is the first thing adjusted on a new guitar followed by the nut and saddle. The nut and saddle are what should be used to adjust action. Truss rods need to be tweaked on wooden guitars due to temperature and humidity changes.
On a carbon fiber guitar without a truss rod the builder is supposed to make sure the neck has proper relief in the construction of the guitar, which is an ever so slight backbow. Earlier CA guitars (pre peavey) there were reports of incorrect neck angles. Those guitars should not have passed a QA inspection. Haven't heard of any issues with current CA necks.
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