Hi Carly and welcome to CS,
Sorry to bring bad tidings, but your grinder is not really adequate for the job. I would have thought the people you purchased from would have asked what you had and then advised you appropriately?
At the very least, set your sights on a Breville Smart grinder. More appropriate would be something from a manufacturer like Mazzer or Compak.
Make sure your beans are also freshly roasted (within the last few weeks). In general, stay away from supermarkets and outlets which cant tell you when your beans were roasted.
You have an excellent machine which when matched with a good grinder will deliver terrific coffee.
Good luck ;)