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When you say a non concentric pattern around the center spot, do you mean an oval or something else?
If it travels around the center spot then it is most likely not tilt of the primary. If it is like an oval with one part being very near the center spot and the other part of the elipse way off then this could be tilt.
When you use the Tak scope though and you get concentric rings this indicates that the primary and secondary are orthogonal to each other. One of those rings is the primary.
You have to center the primary as part of using the Tak Scope. You might like to check Ken Crawfords site for the video on how to sort this out.
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