I don't think you are missing much. You are in one of those "dead" level ranges for necros and haven't got a decent DoT upgrade in 12+ levels.
If you are an Iksar it can be especially odd, since you probably aren't being bothered too much by allure.
if you weren't iksar you'd prolly be better off using taps instead of the blast. The taps are unresistible hence more mana efficient than they look. Then on top of that you will be able to convert about 80% of life you drain back into mana... assuming you need the health this functionally means your life tap spells only cost 20% of the mana listed.
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