Thunderclap is enough to keep the aggro of the healer in the beginning of the fight. Start a fight like so: Charge/pull thunderclap, start big heal, while you start DPS and Dev/SS/Revenge, and HS, for all of this you need to spam 1 button (in my case "2" which is my DPS/M-O button), and one button for heal ("3") and HS and Thunderclap on the same button with a modifier ("E" and "Shift-E"). I have yet to lose aggro on the first heal. In Heroics rage generation isn't a problem so you'll be able to use HS a lot, combined with a shield spike it's easy.