Beautiful snake!! Definitely one of the most interesting species out there. I would say that what you're describing is just his natural behavior and it will probably take awhile to break him of it. The "jumping" out of your hands is how they move from tree to tree in the wild, and this instinct combined with him being a baby that thinks the world is out to eat him creates a very flighty snake (no pun intended). I've heard from others that the more fast moving, arboreal colubrids do tend to be a bit more defensive in general, but I wouldn't go so far as to say that they're not meant to be handled or shouldn't be handled. They just require more work, time and patience before they calm down, and, depending on the individual, some never do.

It sounds like you're going about it the right way, handling often (while still allowing him days to chill out) and wearing gloves. In the end you have to decide if it's worth it to you. As long as you're handling him gently but firmly, he basically just has to come to terms with it on his own and there's not much else you can do. I hope he eventually calms down for you, but even if he doesn't, it's still a fascinating snake to have!