I had the same issue, but using an Exceed Pro/6.5T combo on 21t pinion.
Thermal cut off was usually around 7 minutes, gearing down to a 19 has helped, and shoehorning a fan in on top of the ESC has done the last little bit, i'll probably try with a 20 or 21t next time i'm out and see how that goes. Have also now pushed all the settings to "max" and still got no problems. Also opened out the vents on the shell a bit more extensively!
I can now run all the way to the voltage cut off, then put another battery in, and do the same again.
I haven't got the low speed vibration, well, i do, but its not enough to cause a problem, so i've left it well alone.
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