Hi stellar, I agree with your thoughts re quads/thruster set ups. When I first had the Mad dog as a quad I had a few waves run down the line and the quads flew. Riding punchy beach breaks the pivot of the thruster is more useful to me. One thing that a will always want in a thruster set up is the ability to move the centre fin forward and back. The US box in the Naish allows that with the FCS ii H1 fins.
I was out surfing the other day and the surf was larger and had more push than previous day's, after a few waves feeling a little lose on the bottom turns I flipped the board over and moved the centre fin back. Only a few mm but it had an immediate effect, stiffened up the bottom turns without effecting of the tops, it really is a must have feature in a board for me.
My first ever custom surfboard back in the mid eighties, a very nice Town and Country that I still have, the shop recommended a centre box set up. I found the same results with that board, a small movement changed it from a board that felt too stiff, to very versatile setup.
I look forward to seeing your new Smik.
Steve.