Sorry for your troubles. Are the skipped stitches on the top or bottom? Are you turning corners/curves?
I don't know your machine but just checked and there are about 7 videos for your machine that may help get it set.
It may be more or less than the default setting for your machine. I was surprised at a class yesterday when the the LQS owner mentioned changing to a setting of 7 instead of the default of 4 on our machines for FMQ.