My guy looks to be about the same size and he eats weaned rats (about twice the size of a hopper) and just recently he seems to be more hungry than one of those. Reiterating what someone else said, you can go by 10-15% of the body weight or size of the thickest part of the snake. I'm guessing going by either a hopper isn't enough for him.
My humble suggestion would be to offer another hopper and get a larger food source for the next feeding. Or even just get a larger rat and feed that sooner than 7 days.