The Kart guys have dyno evidence that the ceramic bearing s have no gain over a good C4 bearing with the kapton race, also I had a buddy who was using ceramic bearings have one explode, completly destroyed the engine, had to be completley torn apart and cleaned to get rid of all the ceramic bits!
As for the race tec seals I use them but again have no hard evidence that they make more power, but they do feel nice!!!
By the way being 1 jet size out is easily losing you more power than any of these expensive go-fast options!! I prefer to spend my money on track time and trying to get the setup, both motor and chassis spot on!