When I went to quad clinic John had me swap out the 4 wrap in my full vent to a 3 wrap to make it cup more and accelerate faster to keep up with the Djinns during team flying. Seemed counterintuitive at the time,, but worked. His sail loading and tuning videos are now the most helpful. Things flesh out in team that you don't see when flying solo.
My PoloVTD has the centres vented. It creates a very different feel. I can't generate the whump but at the winds I use it at, above 30-40km/h, it doesn't really affect me. I have found that it is more stable inverted than my B Series. The frame doesn't flex under load as much either. Sent from my SM-G950F using KiteLife mobile app