I'm after some advice

i currently have a couple of C4's and i will be doing a crossing over open ocean later in the year and i was wondering if size for size (of the same year) do the edges have more power than the c4's

the reason for asking is i am heavier than the average rider (102kg)and although the recommended sizes for the crossing by the organizers is a nine and a 12m for the predicted wind conditions (and an 80kg rider )
i plan to take a larger kite (13 or 14m maybe) just in case and would like to stick with ozone preferably