The wind is not so bad, sometimes you need an 8 meter
I was with a 134 board, it was Ok
Sometimes, you have wind at Punta Cana , and no wind at Cabarete, but it s true that Cabarete is a better spot.
I just want to say that Punta Cana is a kite spot, and don't forget your stuff.

I was at Punta Cana Club MED in february ,
very good wind with a 10 meters, nice waves, green water( Carribean Coast), the beachs are more beatiful compare with Cabarete
I think that the Club Med has open a kitesurf Club.

Enjoy