While BP who stop eating are frustrating for their owner, it's not something I would be overly worried about at that size.

Feeding live means you must be willing to feed live from that point on and in all honesty if an animal eats F/T and this is what you really want to feed I would suggest to do your best and keep it that way.

The thing I would consider would be to offer less often 7 to 10 days, downsize the enclosure if not done already (down to something like a 12 quarts tub or 10 gallons tank) with very tight hides, and I would lower the temps a bit to 88.

Security is essentil for BP, and learning and understanding their behavior in the wild helps understanding what need to be done, they are secretive animals that will spend 80% to 90% of their life in underground in termite mounts and sometime a vivarium will just leave them to exposed, which often mean stress which translate as food refusal.