In order to test the various panel theories within this post, the test condition should have the panels connected to a fixed load and not to the controller.
As I stated earlier, the controller changes how the panel behaves so the data is skewed.
Example, if the batteries only need 100 watts and the controller consumes 10 watts of energy transferring this energy, then it will make sure the panel will only deliver 110 watts rather than its rated hypothetical 220 watts even though the panel could produce this value due to its direct sun exposure.