How to control the dwg/dxf output?

[Edson]

I am more than happy with the results of exports to jpg and pdf: they look great and enhance what is placed on every LayOut page. it seems that there is a WYSIWYG relationship between LO and image outputs.

not the same with dwg/dxf. even though I used the same elements in two different files one exported reasonably well to dwg while the other has lines that are too thick, unreadable text, etc.

my question is: is there a way to control the dwg output? any rules to be followed besides exporting to model space and setting the render mode to vector? what about the scale: does it make any difference?