For what it is worth, on my trip last year I took my 8'8 Flow V2 and I thought it was great. I am 6'3 and I think I was 95 kg at the time (101 kg now

). If you are going with Moon Tours (recommended) you will see a guy on a red Flow in their gallery - that's me - so the only limitation of the board was the rider.
But as Tardy says, if you feel confident on the Revolution it is probably best to stick with it (unless you will have enough time to become confident on the Flow). When the waves stand up, and you are looking down into blue water covering sharp coral, you don't want to be second-guessing how to ride the board.