I have a 1200 watt ebikeling rear motor with 48 volt 35 amp. 1680 peak watt controller. with a unit pack power 52 volt 20 amp battery. on a gary fisher tarpon mtb weight is 61 lb. I am 150. total 210. I can get too speed motor 36. flat. I love it. but. can I. get a 1200 watt 20 amp dc...