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Some people change the 'timing' by rotating (advancing) the brush block a few degrees. There is an art to this technique, and is probably best left to your local electric motor repair shop. From what I hear, it isn't particularly expensive, and can increase the performance of a series motor. If you have a transmission with reverse (as opposed to a forward/reverse electric contactor) it looks like a good modification since your motor will always be turning in one direction anyways.
The pulse widths are engineered by the controller manufacturer, so I'm fairly certain that can't be changed (other than to the extent that they are already changed when you step on the accelerator)
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