Fastest elevator climb I've been able to manage over the last few days, incorporates all new strats. The last enemy has some RNG on position but the most consistent setup I find is to just ignore him and fireball skip. If you're not comfortable with a fireball jump there's ways to lure that enemy lower (cling the side of the wall for one jump) and then pogo it.
https://www.youtube.com/watch?v=pzJsEwcLK2I