I just finished a large mystic stitch design. Lots of one stitch of a color all over it. I sucked it up and did one stitch all the time, if I didnt, I would lose all the shading. I did not park needles, but I did travel on the back. If I was traveling over stitches not done yet, I just traveled. If I traveled on stitches already done, I put the needle under the threads on the back so you wouldnt have long stitches on the back. My back looked almost as good as my front.
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Great to hear of peoples different ways of coping with these kind of designs. I have to say Ive always just kind of made it up as I went along. Ill be trying out some of these new tips though and hopefully my work will look better for it.