I'm not sure how helpful this will be but my BP hadn't eaten for the first couple of weeks I had her and I found success tonight

I left the rat thawing by the vivarium so as to allow her to smell that it was tea time and was a little encouraged that I saw her head slightly out of the hides (She usually hides right at then back). I heated it and prepared to do the "zombie dance" when, like a clutz, I dropped the rat into the vivarium at an angle where I couldn't quite get the back end again so I used the tongs to wiggle the rat slightly on the floor, nose facing the hide door. Before I had time to blink she had struck and constricted.

If all the F/T techniques just aren't working then understandably go to live feeders, anything for the health of your BP but thought I would share my little piece of very strange, and new experience (first time feeding a BP so a little over happy)

Good Luck!!