Thanks for the responses. I am now tanking the named if there are several adds in many cases, but not all the time. Grabbing all the adds and having the other tank snap the named with singular focus sounds like a great idea.
Not just the tanks job Troub with a good AV on you (Tank) works a treat imo - I have even tanked the adds on Commanders with AV and VoN and am a Troub
Dirge tanks scout add on Amamlgamon & Corc with it on Mage add (same mob)
Guardian = main tank not off tank