Hello i am Mark 62, and i bought my first ebike on 7-2-19,a rad rover. Being 6'5" and 260, i ride hard. Being said i am learning still, already had a rear flat, and now pedal assisant has cracked. Its still under warranty, but seems flimsy, how do i upgrade to something better. I ride as fast i can go and pedal as hard as i can, but ride from home to work is 20 miles one way, with 1300 foot uphill. I need a good assisant. Any suggestions?