The thought had crossed my mind of replacing the batteries with a beefier pair, but i am concerned about weight. We'll see what the power is like when it is charged up.
When i get a bit of time, i'll be able to see where the weak-point is. ie - do the batteries have the current capacity to accelerate the motor well? Is the motor just a pathetic lump? is the controller so cheaply built that it can't supply a decent starting current?
I also considered taking the whole thing apart and using the parts in a bicycle conversion.... one thing at a time... it is on the charger now