I changed tension gradually and kept notes of what showed on each side.I always do that when fiddling with tension. Thanks for all those that gave suggestions. It's so great to be able to ask questions and get lots of feedback.
My friend came last night and helped me. We tried all the suggestions offered here but it didn't help. I am going to use the next few days to do some cleanup in my sewing room and also work on my hand quilting project. I will have to take 'Dobbin' to the repair place at the end of January. Hope he just needs something minor.