H2s is that historically they are a fragile fin so be careful with them in the shorey and I would be interested to hear how they would hold up in a sup in bigger surf or on heavy turns.
If you are looking for this qualities (toughness and holding up at speed), you may want to try the c-drive fins
www.cdrivefins.com/ . I love them for big condtions, the wide base hold perfectly when you do not have enough speed yet (on take off and drop), but the narrow profile and chord keep them super efficient at high speed, while keeping agility, no hint of a "foil effect" as in bigger fins. XL size for my 100kg is OK.
They may not have enough "spring" for playful conditions however, and sturdy as they are, I do no want to fall on them, they do not seem to break easily to avoid injury.