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If messing with the field will only give 10% and risk damage to the motor i would shy away from that if it were me.
I would play around with the battery pack configuration.
Either adding more cells to raise the voltage or rewiring the pack to be 2 strings of 230v rather than 4 strings of 130v.
If redoing the pack configuration caused too much reduction in torque at low speeds then maybe make the configuration adaptive.
At low speeds 4 strings of 130v and high current then at some speed flick a switch and have contactors in the pack that change it to 2 strings of 230v. Sort of like a 2 speed gearbox. It would give you the high current at low speeds and high voltage at high speeds.
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