Boas all have very different and very pronounced personalities compared to the Balls. I have a 6-7 month old juvenile female Dum who, even though I feed her every Friday on "feeding day" will sometimes look at my hand two days later like..."Okay mom, where's the food?" Your snake's "I'm starving!" reaction is likely because of the neglect, and now that she is fed regularly, she just wand to take advantage of that while she can. I have a female ball that was neglected and she was voracious for the first year or so I had her. She has only now calmed down enough that I can reach in and pick her up without her posturing. Lol. Your girl will calm down over time with regular feedings. (Hopefully).

As to that "S shape" posture, my boa does that when she's chillin on my neck if someone walks up or sits down next to me. It's almost like "Hey! This is my warm comfy place! What do you want...Oh, nothing? Okay, well, I can relax now." lol. He too will probably calm down over time with regular handlings.

The light thing though, none of my kids do that. I've heard of boas and retics doing it before, but personally I have no experience with it. Perhaps someone with more experience with boas could chime in and help with that bit.

Good luck with your new boy! He's a good looking snake!