After testing, I think that the Larry Allsion 6 inch Stinger is excellent for flat water for the SIC RS 14 x 24.5!! Really makes the board come alive. Clocking personal best times on it and tracking well even at mid box. Lots of room in the box for adjustment forward and back. In most boards, this fin might run too shallow, but I think the grooves on the bottom really help with tracking and minimize the need for fin depth.