Slow down to prevent the sloppy stitch frustration-speed comes with experience.
Get the bottom tension right- then work on the top-never take for granted it looks pretty on the back- you have to L@@K from time to time.
If it doesn't feel right it probably isn't.
Practice practice practice- not just at the machine. There is a reason it's suggested you try drawing your design before stitching.....I have gone thru 2 sketch pads. I can go back to when I first started doodling and stitching and I see the huge improvement.
Is this all. Nope-I have had my machine 3 weeks- these are only "what I have learned" to share with other new owners. There is still a lot of learning to go.
Thanks for looking and any comments or suggestions for a newbie (me) will be greatly appreciated.