Mario
A look at one of your images would help - but I would say if you can already go 1 min unguided at that focal length, then the next step is to get guiding working.
The movement could be, and probably is, caused by many things. Guiding can fix a lot of different issues for you, including PE, polar misalignment, mechanical issues etc etc.
You need to have guiding working before you try to train the mount for PEC. That would be the next step after you get guiding working.
Keep at it...
James
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