Basically, the Shinn wave is 148 x 42, 5 fins - has a thruster config 7cm centre and 55mm rail - and twin tips front 2 fins must be around 40~50mm ... got a feeling those front fins could still just grab/catch a bit of wave when riding in surf mode ...
Mako-king 165 x 45, only has 1 x front fin (G10) and you can take out the back 2 rail fins for twin tip mode ... so just, one centre fin each end, because the massive 18mm concave provides a lot of bite on it's own - this deep concave also seems to reduce spray almost totally ...
Can also, get the Mako's in 140 x 40 (great in sloppy waves too), 150 x 40 (for bigger guys on flat water lite wind, or for small choppy surf)