setup for crt.5???

[RUSTED]

hey,

my setup right now is a 7l motor powered by a 2s lipo , the setup ran very hot and i got only 8-9 min of runtime , im looking for a better setup , the pinion gears i have r 12,17,18 wth stock spur , and i moved the motor to the front and now i have to use 2 small ipo packs in the rear im using the rcm extended chassis , should i get 1)a medusa 36-50-1600 with 18t pinion and 2 small 4s batteries wired in parallel,, 2)a medusa 36-50-1600 with 18t pinion and 2 small 2s lipoes wired in series , or 3) use the 7l motor i have and 2 3s lipos wired in parallel????

i want my runtime to be about 15+ min and for the setup to run cool , im using the mm esc with a ubec ,, so wat motor and battery should i get >?????


thnks