I think Ted's argument against the bunji is that our spin sheet doesn't have any slack in it and the bunji pulls things at angles and interferes with his sheeting from the trapeze. The bunji would probably be fine if the sheet were longer (and then we would need that bunji more).

I recently switched to the same system that Ding uses ... with bujis pulling the loose ends toward the edges of the trampoline. That bunji actually runs through a double block at the end of my tack line so the bunjis go loose when the kite tack is pulled out. Ted is not a fan of that system so we're going back to the previous way where he just manages the loose sheet.