: noticing this on some recent boats of mine I forgot if this was a preventable
: condition. Looking for ways to prevent it, or deal with it.

Post curing your boat may help. I have wrapped one boat in black plastic and cooked it in the sun for a while before the final sanding. I sent the boat to a customer so I don't know if it worked, but that was my idea.

I think in the long run resin and glass have different expansion/contraction rates and time will eventually cause some weave pattern to appear regardless of what you do.