I have the Janome HD9 V2 and love it. Straight stitch only, larger bobbin. There is a youtube video out there that is titled why I purchased the Janome HD9 versus the JUKI 2010Q.
The HD9 v2 has some better features. Good luck on your quest.
Some of your stitches look perfect to me. Perhaps your batting is affecting your stitches. Test on just two pieces of fabric.
Also, try moving your needle where your needle comes down closest to where your pressure foot comes down over the "most" feed dogs. It is hard to explain this, except to say,
The pressure in the feed dogs helps keep everything snug while your piece is moving through the machine . Putting your needle closer to the right side, rather than in the middle helps with less movement under the needle. I will see if I can find the video on The QUILT Show that covers this, I'm not very good at explaining.