There are obvious things I will mention first in working on such a dense stitch as this on a quilt top.
1) A good quality stabilizer is paramount... Stitch and Tear is what's underneath my quilt top.
2) Using comparable fabric layers and the stabilizer a test of planned stitches is worth every second. Record each/ width length you've tested. Once you've found a width/length you like. In this case...I liked the left most ... I recorded that to so if I need come back at a later time...I know where I've been and wish to go.
Before you start your satin stitch.... first secure your thread with a few forward/backward straight stitches. ( Thanks for this one Libby) This will keep your thread ends secure. I hate seeing pop ups on this kind of stitch.. so just don't permit it to 'pop' ! ;-)
Though not required on all projects... once I found the length/width I liked, I employed use of a straight stitch on either side the the satin stitch on the far left. This is a Libby technique I think really cleans up edges and produces a class finish!
So now, I move to the real deal with the same preparation. I am using a Superior 1" change 40 wt "Rainbows" thread on this effort. I love the look of this color change.
Key learnings here..
1) DON'T RUSH THE MACHINE by 'helping/pushing as we feed the fabric. LET THE FEED DOGS do the work of moving the fabric. Too much hand help produces irregular stitch length/width.
and finally a straight stitch on the other side.
This produced a pretty nice look.
Finally, remove the excess stitch and tear on the back.