Hi Sarah,
Cardboard then the fleece. I cant really tell how tall yours are but my own popped through last week and today stood at about 3″. I just covered them with more compost. There isn’t sufficient earth around mine to earth up in the more traditional way, i.e., draw earth from between the rows.
So what I would say to you is to cover what you can with the cardboard and the remainder with compost/earth then cover with the fleece.
Don.