Carbon fibre props are an excellent match for the antigravity kit mentioned above.
There are two main failure points in a prop/motor. Bearings and prop hubs. Carbon props on stock motors makes little sense, and while not necessary, the extra punch the antigravity motors afford you, as well as the associated increase in load on the props during aggressive moves or saves (because of this new found punch) are best matched to carbon props. Not just any though. Most are for show. The t-motor carbon props are amazing quality and unlike the stock props under load, they don't dynamically de-pitch (twisting of the prop). This means you have all the thrust the motor can give all the time.
Now, why someone would go back to stock motors is beyond me. Antigravity motors have FAR better bearings and a fractional failure rate compared to the stock motors. The extra punch the motors give you helps get back some of the lost performance after adding all the gadgets, yet does so without a run time penalty. Add more rigid props, better performance and much MUCH better bearings and you have a sweet little upgrade that will improve the looks and reliability of your phantom.
Cheers