Success!
After a number of days of trial and error, I discovered that the lack of throttle response was caused by the temperature not being sensed correctly. My thermistor or my wiring is buggered, so it was reading much higher than reality, causing the inverter logic to think that the plate was too hot, and hence stopping the throttle from responding.
I've got a new thermistor on order, but while that's waiting to arrive, I've just set the max temperature threshold to as high as I can, and presto! The motor spins like a dream!
Thanks so much for the quick responses, Paul. I really appreciate it.
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