Thrusters blend the maneuverability of twin fins with the hold of single fins to create the standard in high performance.  The only downside to a thruster is in lateral areas of the wave that require more drive to connect to the next sections.  Add Vektor fins to the rear quad positions with a thruster setup to give your board added drive and hold.  The added fins will allow you to draw and maintain a higher line in the barrel.  There is better drive/speed during turns and the double foiled fin design is less prone to cavitate and release allowing the board to hold and ride smoother.