Not sure about the offset, but platesolving should work for your 6" SCT. I platesolve with a 10"RC (focal length 2000) plus a ZWO ASI1600 camera, very reliably.
Make sure (a) you are in focus, and (b) you have all the appropriate index files are installed.
You can also try ASTAP if the internal solver is not working?
Can you post an image from your SCT (with the platesolving exposure) and we can see if we can plate solve it?
Hy
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