Since the Chocolate Spawners are nearly preventing you from making special candies you have to focus on two things.
Firstly, prevent the Chocolate from spreading too much. The space in which you can match candies is limited to start with. Allowing the Chocolate to spread freely will only make it more difficult to match candies and earn points.
Secondly, match candies near the bottom of the playing field as often as you can. Doing this will shift the largest amount of candies, hopefully start a chain reaction and create new opportunities to make special candies. Collect candies with the +5 second timer on them as quickly as you can.