I don't know if this is the answer to your question, but at the last stamp camp I attended my demo (now my upline...yeah) mentioned that the wheels have a noticeable seam on them. Perhaps you have to roll your first line making note of the position of where you have the seam (i.e. down against the paper, straight up at 12:00 PM, etc.), then maybe your second line shift over slightly but keep the seam in the same position?
Let me know if this was the trick!
Linda
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