1) Don't rend.
2) Don't 'spam' Heroic Strike. You 'use' Heroic Strike, and stop using it based on incoming rage. Use your bloodrage ability as a cooldown if you go through a rage 'dry' patch, but try to manage your rage better. 'Spam' is mindless, don't do it.
3) Go beat on a target dummy to get your rotation down.
4) Can't check armory, but I'm sure someone else will be able to and help you out there.