You should check Kauli Seadi Eco resort. Nice pousada in Sao Miguel do Gostoso with nice infrastructure for wind and kite. I think the season starts a little later than Ceara but August the wind should be fine. A little further from Sao Miguel you should check Pipa beaches and Barra do Cunhaú in Rio...
I guess the difference from a 9m LEI to a 12m foil kite would be worth on a regular light wind place.
The 9m on long lines get me going on my 63kg until 9-10 knots I guess but I´m looking for the lowest end and I thing I would go for a foil kite just don´t know the size yet.
If you are at Cape Town reach Wolf (wolf@kitekahunas.com)or Christine (christine@kitekahunas.com) from Kitekahunas. It´s a kite school but they sell Slingshot gear in CT. Maybe they can ship you over.