Usually it takes a few months for those hormones to “die” down after a neuter so as far as that goes, give it time.
As for the aggression…you have to remember that aggression is usually fear or frustration. Rabbits really don’t have the capacity to be mean. It sounds like Kevin needs a routine to feel secure. I would advise not trying to grab and pet him and let him explore and relax and enjoy him in this way. He most likely will eventually allow you to pet him once he feels more secure.
I think you have to remember too that our idea of being social may not be the same idea that a rabbit has. Most times I’ve had to change my behavior and expectations in order to make friends with my rabbits. I’d love to hug and hold everyone of them, but they sure don’t like it….it’s difficult not to, but in the end, they seem to be more content and relax just being around me more than anything else.