The instruction sheet has nothing about transmitter calibration, but it does go through the normal tones.

The ESC setting are all stock defaults other than:

Brake force was changed for defualt to 75%
Drage brake from default to 30%

We have tried Sky Lipo's 3300Mah 20C, Turnigy 5000Mah 30C, GensAce 5000Mah 40C.

As I mentioned this exact, complete electronics set-up has been running in a slash since mid December, and was just remove and installed in the T4 and this issue came about.