Not on team but I read somewhere that biggest variation in weight of boards is in foam ;the foam can be more/less dense according to temp/pressure on day its produced. Obviously manufacturer can control temperature but cant control ambient (air) pressure.
(ie I believe high pressure days cause a more dense foam; since size is constant (relatively) the change in foam density produces the slight variation in weight. (Lay up resin/carbon/kevlar/wood etc will be very tightly controlled)
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