I ridden all sorts of fin setups longboards- including various single-fins, various thruster fins (mostly different models of fcs shortboard fins), and 2+1s. I found that 2+1s are the most versatile and perform in almost all conditions. I also found that positioning is more important than size or model of center fin. I usually have a 6.5-7.5 traditional style center fin (ie. kanoa pro model)... But my question is whether any of you out there have tried experimenting with different sized sidebiters? I know FCS makes a GX and GL model- the GL is not only smaller, but designed so that it sits towards the tail about 1cm more than the GX. I've also seen a few pros on the world tour use normal fcs shortboard fins as sidebiters together with a 7 inch center fin. Does anyone know how the different size and positioning of the sidebiters affect performance. Curious to know what size fins you use in different conditions.