Nice write up.
Ive got nothing against SRR, But a good mate of mine IA MOTORSPORT Runs a simililar setup using the same dyno dynamics rolling road but has a much different technique when running/tuning a car.
Firstly the car is run until it reaches a good operating temperature (Oil nice and warm) not just started up and taken round to the limiter
Then put on the rollers (still running not switched on and off every 2mins) strapped down then run on the dyno.
After each run the car is reved a few times decreasing the rpm each time and then run for a good few mins with the fans on so that the oil/coolant can cool whilst flowing rather than just stopping after running the engine hard
He also normally runs with the bonnets up.
It will be nice to see your results Mark