What's happening with Pounce is that the direct hit is doing 100% WD and the nova is doing 60%. The Curare damage is being REDUCED on the nova, not increased by melee. Which means your damage is way lower than you might think.
You are probably confusing this with when %spell damage boosts passive ele damage. That only works on melee hits.
Also the old LFAQ talks about this:
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