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Geeeez, The rubbish that keeps me awake at night........................

me too.
EB said, that the boat was too overpowerd downwind, but for me it looked rather like underpowered, having difficulties to lift the hull.
In this case a quick fix could be to modify the traveller so they can pull it to windward. If they are overpowered, they should try a smaller gennaker, if they have one.
I guess that best they can do is to pray for winds below 8kts.

Cheers,

Klaus