What sort of waves do you right it in? The points or the beachies?
I would be thinking along the lines of L-Flex 8, or 7.5. And GX/GXQ side bites.
www.trueames.com/products/l-flex-surf-finIn my humble opinion, if either of those set-ups don't feel good, you are likely to have a dud board... Potentially bad combo of rocker, template, rails, concaves...
South Coast have the L-Flex fins.
Some people say that Fins are the "Salt & Pepper" to a good dish. Just gives the finishing touches...