I haven't time today to read the whole thread, sorry. But one thing that really helped me was purchasing a teflon mat to cover the sewing bed of my table. I noticed a lot of "jumping" as static built up and made my stitch line crooked. Try using the teflon mat you can buy to put in your oven. It's pretty inexpensive. If you like it, then try the more expensive "slider" mats. They advertise in most of the magazines.