I used SwiftKey Flow for a couple weeks, but I didn't like how it spaces things when you use prediction. Couldn't get used to the autocorrect settings, either. Plus, the prediction never really worked well. When I used Swiftkey 3, the prediction was amazing. Not so much with Swiftkey Flow. I'm back on Swype beta and much happier with it.
It all started when I accidentally installed some 'Updates', which I never typically do unless there's some problem or glitch with an app I'm using, sent to my phone from the goo play store, or wherever they come from, out there in the ether-sphere.