Yeah that also made it pretty hard to find - I avoided grinding for that spot until I'd exhausted every other location! When I first saw the kelp/rock combo I had thought that when I had the flippers they would work like the air tanks and always be equipped (which actually it probably wouldn't break anything at that point if they were?). The overall grind was long but also rewarding - I think that section is the only bit that super stands out as needing rebalancing. It's pretty well paced once you figure out where to get everything!