I live at the top of a longish, very steep hill on a dirt road. I am older and not very strong. My Rad Step-thru can't make it up the hill without very vigorous all-out pedaling. i put the assist on 5 and the gear on 1. With the wattage already maxed at 750, the throttle is pretty useless. is there anything i can do to increase the power of the bike or other setting that might be better? I like the bike under relatively easy conditions, but I expectred more and am somewhat disappointed.