Here is a thought - bad motor sensors?
Perhaps it could be the sensors and not the ESC? The sensors are exhangable and one or more may have gone bad/be in need of cleaning. Perhaps sensor alignment is also an explanation to why some motors work well with certain ESCs whereas others do not?
Saying a systems coggs up to half throttle makes me suspect the sensor in the motor rather than the ESC.
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The Tamiya Sheep
Various Tamiyas including TRF201 and TRF511
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