trial & error isn't going well with my mom either..
I can't remember all the types of hair, so I'll just tell you how mine is..
On the top layer, its a bit frizzy sometimes, but it has the "S" pattern, and sometimes it's ringlets.
I don't have any root-curls

The bottom layers are all ringlets.
The back of my hairr- the top layer isn't ringlet-ty, it's more... frizzy. The bottom layer is all ringlets, tight and bigg.
The sides of my head are all ringlets, except for the frizzy top, of course..
But most of the time, I can fix the frizzy top layer.
Ohh, and it's lenge is.. well, resting on my shoulders, I guess.
Wow, I hope it isn't toooo confusing. Hope it helps (: