At 9 weeks old, I would maybe start with backing down for some days.
We just got a new rescue, 2 years old very crabby, very scared of us. He has been in his new larger cage. He has been alone in a room by himself for awhile before we got him. I have talked to him at night, given him a few treats, got a pet in on his head once.
Today after having him for a few weeks, we took him to the bathroom and let him run around the room. He was very very jumpy, but didn't bite, just lots of crabbing at times, he even walked on us a little bit.
So I would give him soon room for awhile, maybe start with a glider safe room visit and NOT a bonding pouch if he hates it that much. Talk to him in evening after he gets out.
Some of our gliders still like to crab at us from their sleeping pouch after months and months with us.
Scarface was almost 2 when we got her about 1 year ago, she still spends all her time in bonding pouch trying to get out. But I picked her the other day and she didn't try to bite or nip me, I put her on me and we went to kitchen for mealworm time.