Determining the right board size is challenging because it depends on a few factors:
1. How steady the wind is where you ride.
2. How powered up you ride for the prevailing conditions.
3. What other boards you have in your quiver.
I have the 138 x 42 Raptor Extreme, 132 LTD, and a 154 Slicer for light wind. The variables I listed above play an important role, so for example, I ride as powered up as possible, but because the wind is so variable where I ride, I rarely ride the 132. The 138 is my go to, but there are days where I have to ride the slicer because the lulls are so huge.