I haven't gotten to 12 stitches per inch, but I am able to get 10 stitches per inch. I use a hoop, poly or poly blend for batting, a between #11 needle, and thimble. I find I have to quilt down (towards me) and as soon as I feel the tip of the needle on the bottom, I rock it right back up as straight as possible. As others mentioned...do NOT use warm & natural.