You will be a rocket upwind!
You will probably need an all carbon boat to cope with the loads.
Down wind will be a different story. If you get a spi kit to your A-cat you will solve that problem.
Note, not all A-cats can cope with the extra loads from the spi. Flyer and Marstrom A-cats has been using spi without problems.
Dough Graf was almost your weight range and was among the first at the weather mark when he was sailing in the worlds!
The weight range is wide, from 65 kg to 100+.
/Hakan