I have tried the 505 spray on stabilizer, then placing the satin on top, smoothing using a small "wallpaper" roller, then pinning satin to stabilizer, I have used both tearaway and cutaway stabilizer.
I have used solvy on top
So far my best result is sticky stabilizer and smoothing the satin on top.
I did email Kenny at Embroidery Library a while back and he did admit that satin is just going to pucker at little. Mine is puckering a lot!! LOL Of course, this was before EL had done the videos.
I think I'm going to do test strips and write down my experiments...maybe I need a refresher course. I think one of the problems is I'm embroidering sashes which are only a total of 5 inches wide so a strip isn't wide enough to "hoop on all sides". It almost seems as if it is a tension problem but I never adjust the tension.