you can get these off ebay for $30 including postage from the US, they are plastic and just snap in, make the board track pretty well to.
Hi
Nalu 10'6. Have a shallow river (6" deep in spots) out front that meanders along the beach and empties into the sea . Sand bottom if that makes a difference.
90 Mile
Have you tried paddling it with just the side fins.. Just a thought..
btw .. You need to stand well forward on that board.. Ahead of the hand hole and so the tail is slightly lifted from the surface of the water.
DJ