My snakes are still little (hatched August and September of this year and just under 200g empty), but it looks like I'm going to end up with this problem. My male has been inviting himself out of the tub at feeding time, and so far I've been able to guide him back in before offering food. Waiting to see what happens when he gets bigger though!

My rosy boas are doing this now too, except they are in a tank instead of a tub. A few days ago when I was feeding them, both were rearing up as high as they could go without support as I lowered their food in. One snake missed and hit the side of the tank, then immediately hit the tongs, before finally getting the pink. The other snake kept following the tongs until I finally got him zeroed in on the pink.