Noob questions here, so be kind to me please.....

Got a cyclone 12, and had one run at local state titles and am a bit hooked on these little things. Coolest thing I have ever driven by a long margin.

I was suffering runtime issues due to crappy packs(6 month old 4200SHO from my TC) and over gearing to keep up with the guys using 5.5's as I was only using 10x1 brushed. So I have now got a new B/L system to remedy the speed issues, and a new 200mah lipo rx pack to help my servo(KO PDS949 I think?) be a bit faster and help with a bit more runtime.

Questions are 1) What would be a good starting rollout(in mm-we are metric in Australia!) for a 5.5 motor on a med-large flowing ashphalt track and 2) Do I need to run a voltage reg on the rx pack or will the lipo voltage fry things? Running LRP Sphere Comp/x11 5.5t, servo as mentioned, and Futaba HRS rx.

Thanks

Matt