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paperboy said..
what is the best place to shave them , thickness or width in regards to performance
I'd say reducing width has a dramatic effect both on rail-to-rail swiftness... and instability. Reducing thickness is somewhat less spectacular, you get a just a better "feel" for the board, which is quite pleasant in hollow conditions.
Also, reducing the volume will slow down the board paddling speed, and performance in weak waves.
So my advice:
- reduce volume, but keep some if you plan to use it also in weak waves
- reduce width as much as you feel comfortable with. Hint: the older you get, the more width you will enjoy. Also no need to go narrower than what your technique can manage: no need to have a board that go rail-to-rail in a blink if you do not have the expertise to thread turns as fast as that.
- then, reduce thickness. Note that you can reduce rail thickness specifically (domed deck, step rails, volume distribution more towards center)
My "vanguard" board is at neutral floatation: its volume (in liters) = my weight + weight of board (in kg). It feels nearly as stable as a pointed nose board of 20 liters more. But it is not enough volume for fun in weak waves. I would have added 10 liters to use it as a one board quiver, but the low volume make it a great board for powerful but choppy conditions. It is wide (for a vanguard) at 29", but I enjoy the stability... I could have got to 28" I guess, but not narrower for my 55 years.