i agree wholeheartedly with the responses you are getting. Over the years I have found that there are certain designs that my brain and hands just wont coordinate together with. If one doesn't seem comfortable try a different one. My go to is stippling and flower echoes. the other thing that helped me was slowing down the speed .
If your machine has a speed option use it. My foot always wanted to go to the floor and I would get uneven stitches and eyelashes on the curves.
I wish I could send the tops out to get longarmed but with as many tops I make it is way out of my budget