Congrats on the new addition. Boas absolutely rock.
A few quick tips on husbandry (I would double check for Hog Island Boas, but usually husbandry is pretty similar throughout Hogs Islands, BCI, BCC, etc).
90-91F is probably too hot for a hot spot. BP's like 88-90F, but Boas prefer 86-88F with 88F being the highest I would go. The warm side for my BCI is consistently 86-87F and she digests fine. I had tried keeping at 87-89F and she barely used it. She uses the hot spot to digest now that it's around 86F.
I would aim for ambient temps of about 80-82F, with a cool spot no hotter than 80F and not lower than 75-76F. I keep mine about 78F.
Humidity sounds good.
Boas are ferocious feeders, so use tongs for sure.
There are a bunch of Boa people on here and they will probably chime in as well.
Good luck and keep us in the loop. Also, PICTURES! No pictures it didn't happen.