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When setting up for arc seconds, have you put your guidescope focal length in to the guider settings window? If you created the guiding profile using the new profile wizard it would have asked for it and the focal length you need there is the guider scope length, unless you are using an off axis guider, in which case it is the focal length of the main scope.
Pretty much what others have said, it almost does not matter what the graph looks like if your stars are round and tight. If they are round but bloated for instance then you are probably using a short guide exposure and the system is trying to guide out the seeing (Which is not possible)
More or less the graph is just a pointer for if it is all going OK and a place to start looking if you are having problems. I wish mine looked that smooth but I am guiding at 2200mm which is a lot more demanding.
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