Dampening issue on Y-axis (VC3.1 - 300 enclosed)

Hi I have a dampening issue on the y-axis (I think). I believe that the left linear rail starts "rubbing" once I tighten the gantry bolts and have tension on the belts. I have been figthing this ever since I have the printer 2 years ago. usually, I can "fuss about" intill it's gone but not today. Any tips? (X-axis seems smooth as babies bottom...)
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Solution
btw, made a first successfull print. not 100% content with the quality yet but good enough to mark this solved. Thanx @mazas !
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