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Firstly, thanks for reply and amazing work you're doing!

Strange, it looks like slicer or settings depends on output in that case. I tried to compare it as much as I could before uploading here earlier:
https://imgur.com/a/LLRsFsa
But I understand your concern as I'm not 3d modeler and have little experience. Sorry for making confusion.

Additional question. After printing your mounting and duct for original parts and fans for Ender 3, and printing the same gcode 'micro test' tower, I saw that nozzle created a ton of little strings, looking like dust, covering half of print. On stock cooling everything was ok.
https://i.imgur.com/a5pQJmf.jpg

Fan through printing was set at 100% (255) and hotend temperature was set to 205*C.

Here is the position of duct:
https://i.imgur.com/qbjxqvq.jpg

And water test:
https://imgur.com/a/KhsdVCP

Sadly, there is almost no change in overhangs too, but I assume that this might be connected with other potential problems and not with cooling:
https://i.imgur.com/rPr3EYz.jpg

Duct was printed with recommended lh 0.12 and speed of 48.