Some snakes just have a "bad attitude", regardless of what you do, while some really defensive and skittish babies calm down as they put size on them - Your snake sees you as this big, scary creature that wants to eat him.
My suggestion would be to not grab at him at all but do some cage maintenence a couple times per day for a few weeks, once he gets used to your presence then start hook training slowly, you want to build trust when it comes to the big snakes, every time you grab him and freak him out you lose that trust.
Retics are very intelligent animals, just give him time and space. Do be prepared to end up with a sketchy adult snake, like i said some never do calm down - I had a couple large (14'+) Retics that were always sketchy and never tolerated interaction well.

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