Do your damage as an elementalist. Use your secondary profession for other things.
/Me is great very early on for Ether Feast, and a little later on for Arcane Echo. By the time those are both useless, you're pretty close to point in the game at which you have access to all the different secondary professions anyway. Ele/Me is also a super-easy combo to beat the Doppleganger with (max Domination, min Water Magic, and just bring the two spells Empathy and Ice Spear).
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