Shouldn't be an issue. If I remember correctly, I didn't get any more or less with the stock vs the +5. What you don't get is very much airflow into the cockpit so for you it will be nice, for me, I'm thinking i'm going to put the lower shield on for summer. I suffer in the heat.
Copy that...
My thought though is to buy it and the Air Wings at the same time. Have them pull some air into the cabin portion of the Sling.
Are they not enough?