Avoid shifting your hips sideways
Mechanism / Why It Happens
Pulling the board with your hips can make it spin harder, but it also makes it harder to land back on it.
In a kickflip, it is true that because your foot flicks through toward the heel side, moving your foot together with your hips can also add rotational force to the board. However, if your center of gravity moves too far horizontally, you will no longer be able to get back over the board.

What to Do
You can still move toward the heel side even if you jump straight up
Since your foot flicks through toward the heel side, it is natural for the board to move in that dir