After I made my post, I see you have a 4-40 all-thread all the way thru your CF tube?? If that's the case and you are just using the CF to stiffen the rod, you should be OK as long as you don't get stress fatigue where the threads meet the tube. The set-up I use below has a short piece (1 1/2" or so) of 4-40 rod glued into each end of a CF tube, with the factory threaded inch or so sticking out of each end. My rod doesn't go all the way thru the tube, just glued into each end. Original post below:

I run identical set-ups on all kinds of planes. The only thing I do differently is I score the 4-40 rod pretty good with a pair of diagonal cutters to give the JB Weld something to bite into. I also make it go up into the CF tube about twice as far as the Central Hobbies titanium thread pieces. Never had a problem, and I'm running them on a Whiplash that has a lot more vibration than most planes will ever see, at pretty good speeds. The set on the current Whiplash has even been thru a crash (45 degree angle into hard dirt at close to 200 mph). I also run them on my profiles, just easy to make up a pushrod with no soldering. Same set-up on the 4-40 ball links, everything. I know it's overkill on a profile, but it is slop free, light, and looks neat. One other thing...I take a brass ferrule that goes thru the rubber grommet on a servo and slide it over the 4-40 rod and into the CF tube while the JB is still wet. That gives me a nicely finished end. Looks neat and keeps a wad of JB from being on the end of your rod.