I would guess that for different teams at different levels, the "scoring speed" could go either way.
For our team - Mass Defiance - we definitely score better in the air. The tunnel the so unforgiving to our team having 3 6+ footers. We are forced to make very precise moves and fix them before we can key a formation, and it sometimes takes time to get back on balance. In the air, we can slide around the sky a bit while clicking through. I know it doesn't sound pretty, which is why I suspect that a 19+ average team might have the opposite experience.
-jim