I have a 2006 ez-go 36v.pds. lifted, 22" tires with rear seat. the cart is used by kids in campgrounds and rolling hills, usually 4 people at a time... The problem i have is pulling hills , speed is fine but I need more torque..My question is What size and brand controller would best solve my torque issues,and where would be the best place to purchase... I've been told not to go over 400 amp with out motor upgrade... anyone with an opinion..