Getting all that fabric in the throat of a DSM is difficult but if you work in sections from the centre out, it can be a bit easier. I have not done FMQ yet but do lots of echo quilting following the outside edges (or inside edges) of my design pattern. I (for the most part) do not do SITD but do the width of the presser foot alongside the edges of the seams in my design (so much easier) & the look is better (I think). Make sure you use your walking foot as it will feed the fabric through your quilt with much better results. I do have a specialized item (even feed foot) on my Bernina 820 that is supposed to be as good as a walking foot but I have found for quilting, the walking foot is absolutely a necessity. If you go into pictures section I have a quilt on there called "Shades of Blue Carpenter's Star" & it shows the quilting design that I did & you may prefer trying that. All straight geometric stitches & IMHO enhances the design of that particular quilt. Give it a look & it may inspire you. Don't give up...........you will work it out.