A heard about new tails for downwind racing, with more top end than the 21F and more stability than 20 carve. For surfing i don’t know.
I understand the argument for monobloc tails, and I know it goes counter to their design ethos, but it’s been great switching to a fuse adapter and shimming a KD tail. Maximum efficiency aside, I’m able to tune things to suit my current level of control and how I want it to feel. As my riding changes I can make small changes without throwing everything out for something else completely when all I wanted was a little less fuse length or a little less angle of attack. I don’t see myself going back without a good reason.