Striping 12-6 is most efficient for amoeba shaped fairways, half and half for traditional fairly symmetrical fairways. Varying the direction of stripe to avoid grain is pointless in my opinion, in that case you should just stripe 12-6 opposite the next mow. I always like the half and half look best, but with the amoeba fairway shape of many of the more modern layouts it looks weird as the center grain line will end up wobbling all over the place.