In general I can tell you this:
if you leave your big kite at home, you will have light winds.
if you leave your small kite at home, you will have strong winds.and if you take all your kites, you will have no wind (happend to me!)
serious, take everything you have.
I don't know about wind in Cabarete, since I only had it for 5 hrs.....
Pls contact Marina at firstname.lastname@example.org
she knows how wind will be at the end of April and what sizes to bring.
My advice: bring, what you have....
Enjoy and let us know how your trip went.