9 times out of 10, issues on the underside is the quilter.......eyelashing is when you are moving your fabric faster than your speed on your machine. Try slowing down, particularly on curves, or speed up if you want to keep your fabric moving faster. There has to be a perfect speed....with your fabric motion and the speed of your machine. This is why it takes a lot of practice. Do some small practice sandwiches and see how your hand motion and machine speed can be matched a little better. Above all, don't get discouraged....BTW those practice squares can be made into pot holders! Just slow down your fabric a little on those curves....and you should be just fine. You didn't say if you were new to FMQ. Also, make sure your fabric is moving freely...sometimes holding on to the fabric too tightly causes you to push harder, which then makes your fabric move to fast. Also, don't mess with your tension for FMQ. Many quilters think that it is their bobbin tension....sew a straight line, if your tension is OK, then it is your speed....slow your hands down or speed up your machine on those curves. If you have skipped stitches it is because you have moved your fabric faster than your machine's ability to do the lock stitch with the bobbin thread.