The secret? It's all in your head & upper body
Surfersvillage Global Surf News, 3 January, 2016 - Most surfers wanting to advance their surfing into a more attacking style go straight for the aerial manoeuvre with limited success. In my experience, this is a mistake, as working on your finbusts first, achieves more consistency and success when progressing your surfing in the long run.
The reason for this is that the finbust is like an aerial on training wheels. It allows the surfer to push their surfing so that the back half of the surfboard breaks free of the waveface but there is still contact between the board and wave. This means that it is easier for the surfer to also stay in contact with the surfboard, making it an easier manoeuvre to perfect.
For surfers who are ready to go in this direction with their surfing , the finbust is in reality, easy to perfect. The secret is - once the surfboard’s tail has broken free the surfer needs to proactively turn their head and upper body to face the surfboard’s nose. This results in the surfer pushing forward and back over the center of their surfboard.
Without this turning of the upper body, the surfer falls backwards, resulting in the inevitable wipeout.