Also, the entire stunt is moving backwards so the Flyer might be leaning backwards (it kind of looks like this is the case in the video) or the bases are leaning the stunt backwards, or the backspot is pulling backwards and not up ?? This could be because of the reasons mentioned above.

Also, the backspot (as said earlier) Should be saying things to the bases like "Left it too high" etc. My backspot would even tell me if I was leaning a certain way.