Echoing Strike / Mirrored Blades WL use Deadly strike, crushing blow, open wounds etc. Warlock cant use those and without those Uber is gonna be a challange.
You can probably kill one Uber after the other separately if you hit them with an Edge (bow) first for "prevent monster heal". Then you Dodge Mephi and just fiercely fire and fire your fire spells.
I am with @mikelessar you should swap to Flickering Flame and other Sources of -% Enemy Resistances.
Idk how the scaling works for the WL but at some point -% Enemy Resists is more desirable then +1 or +2 to Skills, that goes for other classes as well.
You could swap to Eschutas + Fire Facet in Combination with a Head Hunters Glory and 3 Fire Facets, makes a great and cheap JMOD alternative.
Combindet with the Flickering Flame that would allready be -30% to -35% Enemy Fire Resist.
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m3liodas
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