When doing your elevators make sure the flier watches her stance.  If it is wide and pushes the bases out, then it will be harder to hold and seem heavier.  Please NOTE that in most cases this is the flier's doing  and NOT the bases, though there are always exceptions.

So next time your elevator seems heavy make sure the flier is pulling her legs in at shoulder width apart for the ideal elevator.  This will allow you to do extended stunts a little easier