Has anyone changed rotors in the LRP X-12. I am currently running the 17.5 stock rotor and am looking to upgrade if it is worth it. Also if you are running this same set-up what timing are you running. We run on a small dirt track that goes from sticky mud to dust dirt through the night. Got to love Texas... This motor set-up is in a Factory Team SC10, my current gearing is 21-87. Thanks