Quad fin stabilizer setup:
Quad setups are faster, have more drive and are looser than a thruster setup. It can be difficult for people to adjust to the difference in the hold of a thruster and the release of a quad. Use a single Vektor fin in the fifth fin position with a quad setup for more stability. The trailer fin will keep the tail of the board from being too loose or spinning out in turns. This will allow you to push off the tail harder increasing drive through turns without sacrificing the flow and movement typically associated with the quad design. The small fin depth will still allow water to flow through the center of the board with little drag, maintaining the speed of the quad.