Depending on the consistency of the sunflower seed butter you are using, add additional coconut flour until the filling becomes a wet dough. (thebellemethod.com)
I decided to add a couple tsp additional coconut flour, but that didn't seem to help much. (feastingonfruit.com)
Maybe adding a couple of T additional coconut flour would help with the batter not ending up too greasy. (mysweetketo.com)