It is kind of a learning process when figuring out how to properly glaze your crucibles. I’ve used my little torch for it, even without a rosebud tip.
But after some experience and learning with practice is, I always use my bernzomatic Ts8000 with either propane or mapp gas. It’s a bigger torch used for lots of applications but I love it for glazing crucibles and soldering big silver pieces and annealing big pieces.
What I do is get enough borax in the crucible so that some of it sticks, and keep the heat on it with my big torch and swirl the crucible around so that the borax swirls around the inner parts of the crucible.
You could do the same with a big butane torch, but it must be a bigger one.
My first though at reading your post was what another poster though, maybe your flame does not have enough oxygen in it. Make sure you’re getting your flame enough oxygen otherwise it will turn things black, similar to what your crucible looks like after first tries.
I don’t think your crucibles are ruined either, you could re-try them both with borax and the way I do, wouldn’t hurt to try!
Also, Andrew Berry has a couple great videos on preparing a new crucible on his YouTube channel At The Bench.