I think that this will be for aftermarket fin manufacturers to decide since I figure its a bit unlikely that Starboard will make weed fins for the Quad. I also don't know how weed sensitive the original fin setup is. The fins are already a bit sweptback (and the accessory 13cm fins even more so).
But if you really need better weeb clearance, the rear fins are fcs so you can probably fins some kind of very swept back fin (get two symmetrical center fins). But the front... If you can fins a weed fin twin fin in 15cm or so such a fin would probably work. You might have to convert it to minituttle box yourself though, but thats an easy job. Maybe the OES fins? See http://www.oesaustralia.com/wp-conte...uad-75-011.jpg