Who really comes to mind first in choreography are Dmitriev and his partners(as far as acrobatic/contortionist) , especially M&D, Natalia had some of the most incredible contortionist positions, the death spiral in the catchfoot position from 1992 is truly unusual and stunning. They also had some of the most unusual lift exits as well. There was one exit with her being flipped over his shoulders then nd exiting the lift over his back on one foot.
I would say that as far as amplitude on big tricks acrobatics , the Chinese pairs lead the field. Although not a fan of their skating, I was impressed with Zhang and Zhang's twists when I first saw them