It seems that main carries apparent as you bear away in gybe so you are actualy past dead downwind before main flips, which means if you gybe as usual you will be to high on new gybe and main pinned in tight will tip you over.
Yes, when it's very windy I find you need to do an "S" curve when gybing so that as the main goes off onto the new gybe you then need to head back down wind (on the new gybe) to keep the wind out of it until you are ready to power up again.
I've found than having the traveller out
makes this worse as you need to change direction more to initiate the gybe (as you are still holding the kite sheet and so don't have a spare hand to throw the boom over to help you); Also, as the boom can then travel more distance across the boat it gains more momentum and so makes the whole thing worse again.
Somewhere on here I've posted my hi-wind gybiing technique and I will always re-centre the traveller before initiating the gybe.
My tuppence.
