You don't need any darkness at all with autoflowers, that's the nice thing. Any day now you should see preflowers (20 days from sprout for mine) and then it will start to stretch and begin flowering.

You should check out Rusty's Bansai Re-Vegging for some ideas on how to transplant. Looking at these new pics, you can keep it the way it is, but put some more soil in next time or start smaller and do a transplant or two to end up in that pot, the roots grow a lot, especially downward.

Oh, & I think when the leaves do that they are just asking for humidity, like reaching towards the clouds and making a cup to catch the rain...I don't really know, but it seemed to work for me. Really study your plants and how they grow and you will learn to read their "expressions"