Reading this again it looks like there’s a lot to test with the active centre differential also.
“We experimented with lots of different options, during rallies mostly, as tests were too short to do any real work on it.”
“When I approached the apex of the corner, I came on throttle and I needed a smooth transition from brake mode to acceleration mode, which did not upset the car, but applied strong pressure on the front diff to help pull the car into the apex, a relatively strong and specific pressure on the center diff to keep the car neutral, a smooth rising pressure on the rear diff for traction but not too much so as to prevent excessive oversteer. All that depended on the speed of the corner.”
What kind of mechanical construction (open differential, planetary differential) did the centre differential have in the past?