If the S is spiraled, it's still a spiral, just stretched out. 3a hair that's heavy/thick will often have those stretched spirals--my hair's more stretched at the crown, but down past about ear length the spirals are much more compact. it's just because my hair is heavy. Also I often pull it back with jaw clips in front, and that flattens the curl too.
Former longhair, now CG, living in N. California where the fog meets the wind
3a/b, fine, normal porosity/elasticity, high density
Conditioner wash and style. That's it!