I have the Futura 93 and wouldn't change the board for anything. But I'm 66-68 kg and I love it cause it is 61.5cm wide and the board goes through lulls better than most equivalent freeride boards I know. It is also fast. Very fast. I would say just under iSonic performance and in rough chop that could be debatable.
But for your size for 5-6 bft I would go as small as possible. You are light enough to go through lulls so as much as I love the Futura I think the JP would be best for you.