Stop with the "feeding outside the enclosure" thing. I've tried both, and there is no change in the animals reaction. All you're doing is stressing them out after they've eaten, by picking them up to move them to another cage. You'll get more regurges than "A friendlier retic" by doing this.
He's either striking because he's feeling vulnerable, after just eating, or he want's more food. Either way, leave him alone in his cage for a few days and let him digest the meal, then interact with him.
If he's normally just agressive, I've always found not caring, letting myself get bit, and still handling the animal is the best approach. Better to just get it over with, and not care than to be afraid of something that's going to happen anyway.
If it comes down to it, and he's just becoming agressive, while he's still smaller and the bite will suck less, just take it. One of my super dwarfs was wild and bitey, so I let her snag my finger, she bit and held on for probably 30 mins, and when she was done, she was done, and she's never bit or struck since.
