The main thing I can say is that the performance seems really close. The Hurricane seems to have a slightly more progressive flex vs the super tip soft flex of the Kashy, but only slightly. The Kashy is for sure softer, but the Fr5b I have is still pretty soft, and so I feel has a great wind range, and can maybe be better as the wind increases. The two biggest differences: Kashy $800 + and 1 year wait, Hurricane $350 and 1 month wait!
i called ottmar from hurricane, the number combination with the 4 numbers are the production month an year, the number combination with the 3 numbers are the stiffness! for sure.
an amendment statement: the two first scribed numbers are the measurement of the stiffness, the last scribed number are the measurement ot the tortional stiffness (twist) of the fin.