Just to report back, on my last Modelsport order, I picked up a cheap ESC and 20T motor and I can drift now, ok, let me re-phrase that, the car is driftable now!
Could actually use a little more power, I will prolly grab a 15T Firebolt on the next order, but my conclusion is the 6.5T was just far too mental for drifting, or at least for learning to drift with.