The problem is mostly solved. Those oscillations are still here, but the images are fine now.
To connect the ED80 I use a photo screw, not the telescope rings... As a result connection between the telescope and the mount in a single point and there are vibrations that are mostly in the RA direction because I'm testing my mount on 0 deg DEC.
I will still continue to work on those oscillations and bring out the conclusions.
During the testings, some images came out like M101.
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