Hang on... I just realised it's you... haha... late here!
Basically exactly the same as how I have tuned your car recently!
That's the strategy.
Partial load mapping on a dyno can only be done with one that can hold load (there are various methods). Some dyno jets can do this.
However, for us to go that far we would have never developed the map properly in the first place. We would maybe use it just to get some lambda integrator values or anything related to part throttle fuelling at a certain load point.