That's pretty much my rotation: Force Armour, HoT, Deliverance, Healing Trance, HoT. But I'm wondering whether the bubble has any viability at all in hardmodes, especially on bosses that hit so hard that the bubble can't even absorb a single hit. Wouldn't the gcd be used better on just casting heals.
Think of the bubble as a heal, and you'll see it's use. It's basically a 2.5k instant heal, effectively (if you talent for it). In flashpoints and PvP I can bubble an 8 man team in 12 seconds, and if the tank is taking serious damage it can give you 1.5 seconds to slap a channeled heal without them dropping.
It's probably one of the most powerful healing abilities we have.