Help time-stretching (driving me crazy!)

Hi,br
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I’m relatively new to production but I have a basic understanding so I’m not a complete novice. I’m trying to time-stretch a vocal for use in a 170bpm hardcore track. I am unable to manage it with out it becoming super fast and unlistenable and I’m not sure where I am going wrong.br
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I want to time-stretch the vocal from “Neverland” by Kate Lesing. I’ve tried in Ableton/Logic and Bitwig and I just can’t get it. Essentially I want to achieve a similar sound to this.br
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https://www.youtube.com/watch?v=ZjQf3CawOSIbr
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which is a timestretch of this:br
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https://www.youtube.com/watch?v=dXx9t3Qbuc8br
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The vocals do not sound overly sped up. Any help would be greatly appreciated:br
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Cheers,br
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Johnny

Try doing the vocals at half time. i.e. stretch to 85 bpm…br