IMHO SiTD is NOT the easiest kind of quilting. When I started, I was really upset with my ditching, tried free motion and found it much easier. As a teacher, I did a great deal of writing on boards, so I just extended that skill to the quilt. Many of my earlier quilts were full of various words, such as Bible quotes.
Back to your problem. Ditching requires a machine with a very even stitch, as well as a steady hand to look good from really up close. After 443 quilts, not all of mine make that standard, which is why I continue to do more FMQ. However, the good news is that you are probably the only person who will ever give your quilt that kind of scrutiny. Others on this board refer to the 10' rule. If it looks OK from 10 feet, you probably are worrying too much.
One of my quilts that I was very discouraged about and almost left home from a quilt show took "Best of Division". The quilt that took "Best in Show" at our most recent show was made by a friend who almost didn't enter it because she was so discouraged. We are ALL our own harshest critics, even those of us with a pile of blue ribbons.