Alright this is what your going to do. Sounds like your snake has a serious dislike to f.t so I would stray away from that and stick to live prey. A live hopper is best, but go to petco sometimes they have some really small mice that will do as well. Pinks aren't typically fed to bp's, and I have never tried to do this once. My babies started on small mice, or hoppers.
Don't waste time/money on f.t anymore. Its not working. My pastel male hates f/t with a passion and would die before eating it, so live live live!!
Just hang in there man! I know your going nuts right now, but I promise hes fine. Sounds like your doing great otherwise, just stay positive and get that live mouse hopper asap. You want a prey item with fur and a lot of movement. Most bp's can't resist the aroma of a nasty mouse. I think that pinks and less furry items don't give off the scent as well, or move as good either. But good Luck, please let us know how it all goes!