IFC is the standard format for coordination. Usually it is good habit to try out different formats in the beginning of each project. Some engineers prefer DWG others IFC and there are lots of options in each export for what is exported. I usually send them some options to choose from.
In the dialog in your first post, did you try to uncheck the topography? Maybe importing only parts of the model in a blank file will work. You could later reference or copy them together.
Also solid instead of mesh is worth a try. Always import to a empty file not in your main drawing.