I would deff dial them back up a bit - add some compression on them perhaps to bring them inline - it sounds like a vocal being dropped cautiously onto a backing track rather than an in-your-face remix IMHO.
The slicing would really depend on the way the samples are cut up or triggered - its
not the vocal that sounds sliced up/jumpy its the beats
At the big build up ... "oooooo0000000OOOOOOO ..........." with the raising pitch @ 2.26 instead of dropping "were halfway there" before the beat I'd throw "were halfway there" in a bar early around 2.22 so you end up with the vocal "living on a prayer" just before the beat.
I just kinda "expected" on hearing it that I'd be hearing the big "Living on a Prayer" and crowds respond better to predictability especially with mashups of stuff they already know - means they can sing along without thinking too much
Hope that makes sense.
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