I also am a little confused by your post what exactly your question is---and not sure how your practice piece is "Bunching" but it could be a tension issue- you might want to loosen the top tension a tad & see if that helps. I've quilted projects using some home-dec fabrics in the past and not had any problems- it's the same (for me) as quilting any quilt- choose the thread and needle that's right for the project- get the tension right & quilt away...if there is some other *question* , issue you are having please re-post & let us know we may be able to further assist- if we know what the issues are.