UPDATE!
WHOO HOO!
Two feeding attempts, two successes! The GBK was a little shy and hid at first, but I popped the top off her hide and she took the fuzzy on the first strike. Had a little trouble swallowing the shoulders but she got it down.
The JCP was far easier. She just hung out in her hanging plant, missed the first strike, but nailed the second and gulped the pinky rat down in a matter of seconds.
I feel so RELIEVED.
I know that the JCP is not known as a finicky eater, but the GBKs are. I'm glad it went so well for my first ever feeding!