If your machine is ok w/ using different weights in the top & bobbin, then do what you like. Just be sure your needle accomodates the larger weight thread on top. ALWAYS run a test swatch, with all the fabric weight, batting exactly like your quilt is, then you'll know that things will be alright; that's a good practice for any embroidery machine. If the design is moderately or densely stitched in places, you may not want to use a heavier thread, so check the recommendations of the designer, but again, test first.