Thanks very much for the comments and advice!
I picked up a live mouse (a bit small, but a test since they just rejected food yesterday), and will give that a try tonight. If they seem to respond better to live food than I'll make the switch. I'm doing some research now on the best methods to feeding live. I've always fed F/T mice/rats/guinea pigs/rabbits with my Burmese, so this is a new process for me. I'm a bit nervous about the mouse chomping down on my snake, so I'll be there to monitor the process with a chopstick ready to put in the mouse's mouth.
Cheers,
Patrick