Try not just editing the line itself. There's only so much you can do with that, no matter how malleable your voice is as a waveform. Instead, copy your line a couple times and alter each one heavily with different effects. One might be a flange, one might be a chorus, and one might just be heavy bass, creating a sort of growl against the voice. Then paste them all on top of each other.
The result is you'll be able to hear the words despite heavy editing, and you'll have a much wider range of editing options available. Editing of an edit of an edit often leads to synthesis problems. But one edit to the waveform in three separate arenas will yield a much crisper result.
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