Dennis,

It has to do with "angles" ... a stock P19's bridle attachment angles are Vert = 45* and Horz = 45*. On my boat currently the vert = 75* and horz = 15*.

So the forestay load is much more vertically orientated. The two 1/8" spectra lines do not carry any of the load directly, but only hold the foil in it's proper location and the foil itself carries the load.