4-man areas aren't hard. You don't need damage mitigation there. The only things that might threaten it are high-damage Elementalist bosses nukes, but then you've got UA so at worst you take some DP and the guy dies. If you can run around with two full healing Monks + one Smiter in 4-man areas and clear it, then three Smiters obviously should work as well. It is subpar though, as I said.
Heroes don't use GoLE well but it's still a guaranteed 5 energy at least, better than nothing. You can of course run Castigation Signet instead (pick and use as needed).
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