Congrats on your new snake... he is absolutely stunning!!
It actually sounds like you're doing really well with him, the fact that he's more comfortable with you is very promising. If he's never stuck or shown aggression thus far, he probably won't unless he feels threatened. Try to avoid reaching toward his head etc. unexpectedly or making fast movements. You mentioned "grabbing" him from the enclosure - this probably isn't what you meant, but the word "grab" seems to indicate a fast movement. If you DO grab at him quickly and he hasn't struck at you, it's not likely he every will. I'm assuming though that this is not the case.When I reach in for my snakes I always try to take them by the middle of their body (for smaller ones) and then slide that hand up closer to their head and use my other hand to support the back of their body as I'm lifting them out.
As others have mentioned, always be sure you haven't handled prey etc. before offering your hand to your snake. I will often put a TINY amount of hand cleanser on my hands first, there is NO mistaking the smell of hand cleanser and prey.
Honestly though, it sounds like you're coming along just fine, as you get used to the movement of your snake on your hands and arms, you'll gain confidence and you and your little buddy can learn to be completely comfortable with each other.