i think the grooves also add to stiffening up the flex along the front of the board while letting the tail flex a bit. gives it a springy feel.
the board seems like it has a standard tail and central rocker but a flatter entry rocker. I reckon this helps a few things, especially upwind, and the boards got a good compromise in the rocker line. needs a lot of back foot pressure dropping into the small sucky ones, so the nose doesnt dig in and theres no probs. the board is super loose, especially under the front foot, but the rear foot seems rock solid on the bottom turns, and its easy to throw around.
The glass job looks super slick. The bottom glassing is lightish. the heel dents on the top dont seem like a drama and help me to locate my feet.
Regarding paddle surfing it, its super loose and I would like a 200m long shoulder high right hand point break to try it out on rather than waist high mushy one hit closeouts. I prefer a longer short board for paddling and wave count, but for a younger fitter paddler it would be fine.