I've ordered the relays I need to make the motor wiring adjustable from a toggle switch on the handle bars that will control a pair of relays.
Doing this will give me a 2-speed manual electric speed selection.
Series wiring will be used for acceleration. Parallel will be used for top speed.
Doing this should also GREATLY reduce the power consumption during acceleration without sacrificing any performance (since it will in fact give me more available torque).
I will have to do practical tests once the relays are installed to determine what positive effect the configuration has on range. I'm hopeful that it should be a noticeable increase of 20 to 40%.