Back when I worked with rescues and sick snakes, I've tried the "braining". That never worked for me, while other tricks would ...

That said, I would try one more live, smaller pinky, dusted once again.

After that, you can be sure the lost weight is re-gained, the nutribac had a chance to do its work and no regurges happened. That's when I would try f/t again, after at least 5 to 6 days "break", so he's nice and hungry