InDesign export to PDF to final print on plotter Canon iPF770

Hi.

I wonder if some one could explain or show me a web link tutorial on how to correct export final PDF from InDesign to be high quality printed on Plotter (brand CANON iPF770)

This are the explanation on how i do our works, as always, but recently i am struggle with artifacts on final print PDF.
We are an Architecture Office in Lisbon-Portugal. Our main goal with our work/clients is to get Autocad Vector drawings exported to PDF to insert in InDesign.
After we get the vector drawings from Autocad (2018) we made a post-production in Adobe Photoshop were we complete that vectors with background, trees, vegetation, cutout people, so the final result would become more presentable. Normal procedure this days..

After that we compose "Sheet Size Format for Print" and import all files inside InDesign were we create multiple layers to get the right drawing order.
For example:
InDesign Layer order
Top Layer = which contain "Front Trees Cutout" + "People Cutout" (built in Photoshop and save a merge file with transparent background)
Middle Layer = which contain "Autocad PDF with some hatch (Built in Autocad and export to PDF)

Bottom Layer = which contain "Sky and Environment Background" (built in Photoshop and save a merge file with transparent background)

The exported PDF with High Quality and Flattening High quality on our monitor screen show us the pretended result.
Then when we send that PDF to any our plotter or Pro Photo Printer the final result is inaccurate with artifacts or missing some parts of the drawings.

We have read so many thread with similar questions, but any of those could help us resolve this.

best Regards