Thank you so much for this, hopefully the keyboard outline idea helps. I've been having an awful time typing on the pixel, coming from iPhone 6 as well.
It's funny how everyone gets used to what they use. I cannot type on an iPhone keyboard for the life of me. I was a big fan of Swiftkey but the theme that I was using isn't available anymore. I am back to a black Gboard with key outlines now. It's a great keyboard to type on but predictive text is still nowhere near as good as Swiftkey. It can't even get phrases that I use daily right.