I haven't read the other posts, but on a quilt like this what I like to do is a serpentine stitch instead of SID. It is super easy if you simply do the serpentine over the seams, working from one side to the other. Because this stitch takes more thread, I like to use a finer thread -- Aurifil 50wt works really well. To add a little pizzaz, I like to use a variegated Aurifil. (Aurifil 50wt is a 2-ply thread, so it is finer than the more common 50wt 3-ply threads.)
The serpentine stitch is slower to stitch out than a straight stitch, simply because it is meandering left and right; however, it is super easy to do because it is very forgiving. Small deviations do not show up at all. For this reason, I usually do it at my machine's top speed and just feed the quilt through as fast as it will go. It's pretty mindless too. For me, it's the fastest way to finish a quilt.
The other thing I like about serpentine stitch is that it gives a very soft look to the finished quilt.