The filet crocheting I have done just uses a first row of chain stitch and it tells in the directions how many stitches to make. Some start with a second row of single crochet and some with double crochet. I am not sure how you are doing it or if you are using a pattern so other than what I have said I don't know what to tell you.
I love to crochet filet and lace!!
Lynda