Looks fantastic!
For what it worth, I have not experimented much with fins but I have been using a quad setup and it has worked well. Being 12' you have to move your weight around to turn it, but it does respond. On the bigger waves you either need to take off on a good angle or get way back on the tail to avoid nose diving.
I have had a lot of fun on my point break!
Took mine out yesterday morning. They are big, but good fun on the waves. I find it gets good speed up, and turns nice off the tail.
Anyone got a suggestion for a day board bag or cover for the the Point break. It's hard to find any thing that comes in 12' .