My male SD retic is pretty much the same way. He's a wild long term captive of over 5 years old but he was never bity. Just very flighty and would musk when I'd take him out. Breeding season came around and all of a sudden he was Satan snapping at me every chance he got. I think it's just a hormone thing.

Since mine is so small at only 5.5 feet, I moved him from his large Boaphile to a 41 qt tub in another room to make dealing with him easier and to get him further away from the female. Now that I don't have to maneuver a long hook into a long and deep enclosure and chase him around to try to get him out, he's become easier to handle again. It was like trying to get a black racer out of a 4x2x18 enclosure. 18 inches is not much room up & down to work with.

When he was wanting to bite I'd have to grasp him behind the head but now I can give him a foot of leeway from his head again. I'm not sure if it was just breeding season hormones or a combination of that and a dislike for the hook. Maybe your snake is a sexually mature and grumpy boy. Maybe he's upset about something with his environment. Give it some time and see what happens.