If there has been a major change in the size of the enclosure it could be a security issue. He may feel too exposed to strike outside his hide. These animals are all over the board with feeding behaviors. I am beginning to believe it has a lot to do with the first few days of life and what the environment is at that time. I have very few feeding issues and zero aggression issues with babies I have hatched. My babies are touched and manipulated from the time their noses poke out of the egg. The first thing they see is me. Feeding and aggression issues have always come from the outside. Most adapt, some do not. I have very few adult females that have hides. The ones that do are ones with interesting feeding issues like you are experiencing. I have one girl that will only strike from inside her hide. One that will only strike if I put the rat's head in her hide, and one that will only eat if i put the rat in the hide with her (FT). The last one has never struck once in the time I have had her. About 25% of my babies will go through a phase of only striking from inside the hide but they outgrow this behavior in a couple of feedings. Most of the animals I have will actually come half way out of the tub to eat on feeding day. A lot of words on my part, but the short answer is, the snake may outgrow it, it may not. If you are not already, try feeding with very little light. As long as the animal is eating though, I would not worry about it.