Leah Day has talked about this problem. People don’t start learning how to FMQ until a long time after they start piecing. This leads to a disconnect when you start. Your intermediate level piecing projects are getting beginner quilting.
I think if you want to continue quilting economically you should bite the bullet and either do a lot of practicing of walking foot or FMQ or pick your least favorite top and practice your quilting on that. soon, with practice, your Quilting will move to the same level as your piecing. If you quilt in colors that match the quilt the quilting won’t show up as much. Your problem will be solved long term with this solution.
I had the opposite problem. My FMQ was much better than my piecing. I solved this by doing whole cloth quilts. Eventually I spent the time and learned how to piece too. While my FMQ is still better the piecing is coming up to par.
you also have the added bonus that learning a new skill is good for the brain!
good luck
i