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finsup said..
If the tiny details in fin design make a difference, like the wings on quobbas, then surely does an empty fin box.
How about fin box blanks?
Actually, it does not make a lot of difference.
I always filled my boxes for decades (windsurfing then SUPing), it is easy, just cut strips of foam a bit larger than the boxes, they stay put by locking in the inside rail (US Box) or with the screws (FCS). But it was because I am a bit anal on all things fin related.You also can buy boxstix plugs:
www.woodstockshop.com/fr/204_finbox-solutions... but I never could feel a significant difference on the water. I guess it is because the boxes are filled with still water that act as a filler.
Quobba on the other hand, you can feel the difference, because their shape induce a hull vortex with a large effect. Kind of a butterfly effect if you want.