Help- male issue?

[kattabelly]

but curled feathers on the tail now.

He's probably just getting ready to lose them soon. Pullets' tail feathers also often go through stages of looking curved/curled or sticking out a really long way when they're at that age that seems like one long neverending juvenile moult.

He's a bit young to be growing proper sickle feathers yet.

 

[Not-so Slick Chicken]

I have a Black Ameraucana from the same hatchery. Ordered a pullet, turned into a cockerel.
He seems to be a pretty decent rooster (my flock just turned 1)

I don't have good picture examples, but here

First pic, he's 12-13 weeks

Second pic, 15-16 weeks. (He crowed for the first time that day)