I've been thawing food on the lid above his tub and he's all over the place but still pulls back and tries to hide.
That's what I've been doing. If he's hungry, he will eat, if not, it goes to one of the others. It's more frustrating than anything because my other BP is a little more than a year and almost double his size. I know they all grow differently but it's hard to stay out of your own head at times.
He's on large adult mice at the moment and is ready to go up to the next size but refuses to eat rats. I try offering a rat that's a bit smaller than him every few weeks in the hopes that he will take to them but no luck so far. He's probably going to be on mice forever at this rate and that's fine as long as he's willing to eat.