Hey LucyAmazon, I think you're now dealing with a mature male nape instead of a immature/teenager. He wants to hang out around his cage because that's his "nest area". He is defending that area much as he would in the wild. 2 choices, either have him step up and quickly put him down on top of his cage. Or remove him to a stand away from his cage with a stick. Maybe once he's away from his cage he won't be so aggressive. There's several thing s you can do to help lessen the hormonal period. remove shredding materials,,, is he shredding the cage paper? if so use a grate or remove the cage bottom and put paper on the floor. remove wooden toys if he's chewing them alot. Reduce his fat intake to 5% or less. Stop feeding seed/nuts or hipro pellets, start with a lot more fresh veggies and greens, 10-20% fresh fruit. Put him on a diet, weigh him,get him to lose a few grams.
Increase the humidity , especially if you have the aircon on which reduces the humidity. Decrease the amount of daylight hours if possible. maybe let him sleep later and put him to bed earlier. Move his cage to a new area in the house, maybe closer to a more active area. Change out his toys, move the perches/dishes, etc. Put him in a different cage.
Avoid the bites if possible. Don't let him think he's controlling you with this action.Don't let his aggressive lunging drive you away. Stand by the cage until he calms down before walking away. keep him off your shoulder. If he dislikes towels, keep one on your shoulder. Interact with him/reward him while on your hand or arm. He wants on your shoulder because he has much more control over his situation while there. harder for you to remove him. Don't let him become com-placid in any situation, keep changing things up. Be the leader, call the shots, be incharge. IMO he's getting his way and it will be more trouble later. "Nip it in the bud". Win the small battles at first. Don't get into big battles where you give in. If you ask him to step up and he doesn't want to,,don't ask again for several minutes. Turn your back and act like he's missing out. Be animated about what a good time you're having , then ask again.
You need to make as little of an issue as possible with his hormonal issues. Don't do things to encourage him. You want it to pass as quickly as possible. The bigger deal it is now the more issues you'll have in the future.