Hi TeeS
No probs about the question.
We were routinely doing up to 30 or 40 and sometimes 50 EOL's to the ground each day.
The application of Full Carb heat was to keep as much heat as we could in the engine internals to reduce mechanical thermal shock damage due the changes in temp when the throttle was snapped shut.
It also made the mixture slightly richer, which we considered an advantage when running an engine that had the mixture manually trimed from "over rich to normal".