Looks like I'll be going to motorama running stock 2wd. It will be my first time running 17.5 and will be using a killshot with the high torque rotor. What kind of gearing/timing should I start at? I have a 75t spur, have a couple 69t's on order, and ordered 27-35t pinions (already have 20-26) is that a little over kill?