Why don't you just build the daggerboards that are given in the Taipan building plans ?

These are relatively good boards, their profile is suprisingly capable to stay up with the modern designs.

If you are looking to increase performance by getting a new profile for the (same) 290x24 mm dimensions then forget it. There is not nearly enough to be gained there. Any noticeable gains will require a change of aspect ratio and therefor you'll have to let go of the 290x24 mm design box.

Wouter