Good subject! I'm helping my friend make her first quilt, and she started quilting it today with an even-feed foot. There just wasn't enough space between the feed dogs and the foot to make good stitches. I adjusted the stitch length, but that didn't help too much. Took about three passes for me to think about changing the foot pressure! (I piece a lot on my vintage machines, but quilt them on a Bernina with automatic pressure, and rarely have to change it). Anyway, my friend has a 70's Touch and Sew, with the pressure regulator inside the nose plate, so not really obvious. Lowering the pressure made a huge difference in the stitching! BTW, this was with a fairly thick poly batting. Lesson learned, at least until next time!