I've got a special snake too. My blind normal Athena won't take F/T, she likes live. I was really hesitant about going from mice to rats with her, rats are a lot bigger and more dangerous. But the whole 3-4 mice at a feeding was tiring both of us out.
So, we tried the experiment. Now, she's never once had a problem striking, constricting and then swallowing a mouse or four. But now that's she getting rats, she attempts to constrict them before she strikes. Of course that doesn't work very well, the rat can easily get away, but she still tries it two or three times before she strikes and coils properly.
Give her a mouse, and it's strike, coil, eat. With a rat it's coil [escape], coil [escape], coil and lay on the rat [escape], strike, coil, eat.
Gale