Sorry for the major confusion. I am not doing any FMQ. If you SITD you can hide the stitching within the ditch of the blocks. But I am using a walking foot to stitch on the quilt top, out of the ditch, so the lines are very visible.
This is all straight line stitching, no curving, etc.
The walking feet on both of my machines are installed correctly.
If I set my stitch length for 3 I don't get consistent stitches of 3. The Viking walking foot is older so maybe it does not work as well as it once did. The Janome, being newer, is a bit better, but still has the inconsistencies.
Since this doesn't happen with a regular foot I am wondering if it could be tension issues.