2 options come to mind, mostly bc I just tested them on someone. Even though the aerohead was his fastest helmet he said both the Rudy wing and the Smith Jetstream TT helmets were better ventilated.
The rudy was around 6w slower then the Jetstream and the jetstream was about 5w slower than the aerohead.
Or the other way to look at it was the aerohead beat the Rudy wingspan by ~10-11w and the jetstream by ~5-6w
Are you removing the front plug on the P-09? If not that will increase airflow as will using sunglasses vs the visor it comes with
hope that helps