A piece of shock cord from the top of the daggerboard forward and down to
some point on the boat will keep it from floating up in the slot.

Letting out the mainsheet to dump wind will do more for stability than
adding lead to the daggerboard.

Can you reef the sail? Can you add reef points to the sail? Can you wrap
some sail around the mast? Reducing the size of the sail will reduce its
power.

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