I've been trying to remember, its not asif we never capsized it !
I think the key is where you said "hanging" off the centreboard. Thats not gonna work I am afraid, you have to stand on it and get some spinnaker sheet (as roland suggested) - then she'll pop up no trouble !
Yes, the board floats quite high, but it'll keep you fit clambering onto it ! The other advantage is that as it comes up you can swing a leg over and get in, miles better than having an upright boat and 2 bods outside it, cherubs can be a bit tricky to get back into when they catch a gust and the tiller extensions are wrapped in the mainsheet....