Thanks a lot ! It's hard to find fresh new on this very important topic for rails, and you do it very well. Really enthusiastic to see your next screencast on this topic :) !
This is a good stack. You should add tmux to your toolbox, it help a lot managing multi-project and complexe projet + it's a good start for remote (remember all good dev are not in big town) pairprogramming.
you can custom omz to add some fish-like behaviour, for example I use autosuggest