It's about health regen right?.... you sure it's not working? Tried relogging after slotting the abilities? Maybe it's just the UI not updating.
Also don't rely on Addons
We're currently investigating an issue where the UI doesn't update when you slot new Draconic Power abilities. You may be able to fix the tooltip using /reloadui, but a relog will do the trick if that doesn't help. Please note that even if the tooltip doesn't update, the bonuses are still being applied.