Solo Healer KA- Group Set Up

ok I have noticed in a lot of the KA instances I am lacking in DPS bad. I run Monk, Dirge, Inqy, Ranger, Coercer, Defiler. Any recommendation on group change for those DPS check encounters would be appreciated. My goal would be to set up a shaman to solo heal every encounter but honestly I have no clue how to max him out as far as AA. Adornments ....must have items etc. Can someone please advise on what will make the most sense. Losing interest rather quickly because trying to keep up with adds etc due to low dps is just frustrating. I can literally only clear one instance this expansion and my entire group is at 250 plus resolve. I do have greenmist on all toons . I did go all right side Prestige line on all toons and it helped with dps but not enough. Also run deathtouch charm on all toons.
I can replace any toon in the group so I am open to suggestions!
Thanks1
I can replace any toon in the group so I am open to suggestions!
Thanks1