Remember he's still quite young. Snakes are very instinctual creatures, and in the wild they're at their most vulnerable in their youth. So they generally tend to be more skittish by default at this age no matter how carefully they're treated. By all accounts you're doing him right with husbandry, but some snakes just take a little more patience to grow comfortable with the giant weirdos they have to live with.
My suggestion would be, while he's held, let him crawl over the tips of your fingers on his own accord. Say you have him on one hand, and as he starts to move his body around in the air carefully place the fingers of the other hand underneath him so he gets used to the feeling of your touch on his own. After some time of that kind of handling, then you can try more "manual" touching to see if he's gotten more comfortable with it. This is also important to do with the head in particular, as there may come a time where his head needs to be touched (for medical reasons for example) and it's not a bad idea to get a snake used to that at some point. But again, on HIS terms with the method I've described.
To put it all in a sentence, instead of touching the snake, let the snake touch you.
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