Yo. I've had plenty of broms die just the same way you have. I love how they look in the habitat, but when they live such a short life the cash sure does add up fast.
Fortunately I found this amazing article on another site. It is written by Antone Jones and is more thorough than anything else I've found.
I however have not tried to pin the broms to corkbark yet, but I hope this leaves you with more than you started with.

Bromeliads in the Dart Frog Terrarium