Anybody any ideas ?
Put your rudders down.
Even if they're only down part way, it makes a big difference having the rudders in the water. Also get your windward dagger board down at least 1/2 way, otherwise the boat will round into the wind and slip sideways. Getting out through the surf is all about powering up and blasting through the waves, and you can't do that with your rudders up. Getting at least one rudder down and one dagger board down are usually my two biggest priorities when launching through the surf.