Anhedral shape question

Kujiras, particularly the 1440 but also the 1210, curve downward from the fuse then flatten out towards the tips. That was reversed with the 1095(flat from the fuse, then down). The shape of the hyper2 and progression made me think that is a magic formula. But the second gen kujiras go back to the original shape, and I just noticed f-one sk8 does too. Anyone have thoughts about the difference in feel btwn those two designs?