Putting symbiosis on a mage/hunter should help, yet I prefer to ask our Paladins to give me a salvation on pull. That way you don't have to sacrifice defensive cooldowns like Unending Resolve or CoS from your symbiosis.
Also please don't ask your moonkin to give up dmg on pull because tanks struggle with threat (like Starfall on Protectors of the Endless), since the threat buff to 500% in Firelands those days should be behind us. (Still with spawning mobs ofc give the tank a sec.)