Thank you for your help!
I have direct extrusion and Retraction Distance settings in Cura was 6.5 mm by default.
Now I've changed it to 1 mm as you recommended and it works perfectly, no additional changes needed.
Thanks a lot!
I have this weird outer shell hole problem, only when slicing using Cura, looks to be caused by wiping (?) but I'm not sure how to overcome this problem.
Would really appreciate your help!