After looking at images on the net it seems it is a golden crowned snake. Especially considering the movements it was making. Rearing up and flattening it's neck and it would not actually strike open mouthed at the hook.
Ah yep, in the first photo you put up I wasn't sure if the head/neck markings were just reflection of flash from the camera. The other pics are much better, golden crowned forsure.
Agreed. Those head markings are unique to that species and the ventrals are pretty much definitive also. They do put on a nice little bluff show don't they? Gorgeous little snakes and not too dangerous.