Do all of them have hide boxes? It's a little hard to tell. If not, try adding hides. Security is always an issue with BPs, as are proper temps and humidity (humidity, less so with larger juveniles and adults, but it can still be a factor). Too warm, as well as too cold, can inhibit feeding.
Do you know how the breeder presented their rats? Wet/dry/warmed?
I pretty much do what Zincubus does, just with an incandescent light bulb. I let the rodents thaw fully at room temperature in the room with the snakes over several hours. By evening, when the rats are thawed all the way through, I put them under the light for ~12 minutes until they reach a living temp or slightly over to account for cooling. New snakes aren't re-offered, as I don't want to stress them. I just wait them out.
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