When I quilted around the edge of each block I had no problems. There was not a noticeable difference between brands of fusible. I have yet to try quilting on the actual flower. Hopefully I'll be able to let you know what happened next time!
I've been playing with Christina Cameli's new book on free motion machine quilting. The above leafy design is from her book. It's fantastic and if you love to free motion quilt like I do I highly recommend it!