As a pve mage, I have the same set of skills that you have, I would say very effective on elite runs. I can't comment about Gale because Im not personally using it. It takes practice to use it effectively and not become a scatter mage.
Heal vs Shield - if you are doing pve only, I would suggest you take the shield and you can momentarily tank and charge in the middle of the mob to freeze them and drop the time bomb. Mages are squishy, so just spam pots when your hp gets low.
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