One of the Transmutation changes in the next update is a way to see what you're rolling for. I suspect one of the problems people run into is that they're trying to roll something that simply isn't available on that item, for one reason or another -- be it bugs or just misunderstandings of what can show up where. So this will help expose problems. And beyond that, seeing what's going on will let people plan better.
Here's a prototype of what I'm working on. Basically it just pops up a custom "book" screen that lists each possible outcome, and the odds. Eventually we'll wire it into a nicer-looking UI, but for now I just want to make sure the info is available.
There are other changes as well that are still in development.