The stock Castle motors are non-sensored. 8.5T or whatever is less of a guide than the KV, it's little more than a random rating given by manufacturers to show you which is faster (from their own range). KV is far more important - higher KV = lower T.
Get a sensored motor locally, and just the MMP ESC - the Castle motors (currently) are motors for mucking around with - where sensored isn't required.
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