Sadly the Fire's built in keyboard and inability to turn off autocorrect makes ity impossible to type a sentence without errors and rework needed.
So on Swiftkey X how does that work? It auto replaces the built in keyboard or you have to load it each time? is it like Go Launcher and you can pick between the built in keyboard and the Swift one? Looks so much better since it has spaces in between the keys like on the Kindle touch. the fire is cramped and leads to errors