I agree with Utsuho, Clip 4 had the best recording settings.
Try reading the lines at a little lower pitch if you could, this may help you to sound more disinterested and generally mean.
Also, I imagined the lines coming out slightly differently. Emphasis on different parts of the sentence, pauses in different spots, etc...
For instance: Clip 3, the emphasis was on YOU and CAN'T. I would have put accents at KILL and DIE, with a pause between the two parts of the sentence:
YOU can't kill what CAN'T die becomes
you can't KILL <pause> what can't DIE
Or in clip 2, you put emphasis on I, and then the rest of the sentence trailed off from there. I would have put accents at PROBLEM and FIRE, with a pause in between.
I have yet to find a problem that can't be solved with fire becomes
I have yet to find a PROBLEM <pause> that can't be solved with FIRE
Subtle, but important. But that's all a matter of your personal preference. You're the voice actress after all.
Overall, AMAZING. Keep up the good work!