Infernalist non minion builds?

I've seen a lot of talk about the low-life demon form builds, but have seen few guides on it from people I'd trust. Is there something else worth playing with infernal flame? What works the best with Demon Form if that's the go-to?

For anyone wondering I've leveled an infernalist for an idea I've had that didn't work out, I just want to make the best of the character now.