At least one of the healers should run Ele (Elemental) Drain. It obviously gets slotted on your Destro bar.
Costs nothing (zero, zip, nada) and applies Minor Magickasteal that anyone can benefit from (unlike Radiant Aura). More importantly, it applies Major Breach to improve your mag dps against a boss. Apply it to Bosses, mini-bosses, several guys amongst the trash, guild store traders, passing guar, whoever. But seriously, apply to a lot of things although it doesn’t need to be applied to everything (I mean, if you have time like that kudos to your team).
Thank you to Harven for a wonderful little add-on that lets you see different morphs of a skill. Super handy!