The chocolate spawners are a major problem in this level. If any ingredient lands on the same column as the chocolate spawner, it becomes harder as the player needs to move the ingredient to another column, unless you use the free switch booster.
Avoid having any ingredient go to the "stuck zone" (picture shown in red on notes section), either at the end or the middle of the board. However, even if the ingredient is in the stuck zone, it is still possible to switch it back to a column of an exit. The chances of doing so are not high though.