The PBA used an Authority 22 and Bruns. Defy at the Reno WSOB events this year. Which IMO is why you saw lefties dominate. Defy's properties of filling in voids as balls are rolled caused righties equipment to read the friction less and less and during transition and burn you would see a lot of 2 pin combo's. The panels at the stadium were replaced last summer.
The right side doesn't blow open so the advantage never develops for the right side and the lefties are able to keep their angles left...which is their advantage