Hi Guys,
well, to be honest, our own testing found it is always better to put the side fins further fwd if you want to improve the turning? Putting the fins closer together usually does not improve turning, unless they are all too far back in the first place. Best however is to just play around yourself and see what works for you, it also has a lot to do with skill level, weight, type of sail, how high/low you sail your boom, back foot/front foot pressure, type of fins etcetc...:-)) sorry!
But generally on our FW, further FWD front fins = better turning...