I have an issue trying to get a DGN file into Revit for placing rebar and steel detailing.

I've tried the following:

• Import an IFC from designer - model breaks and has strange behavior.
• Convert DGN to a DWG file via FME and import to Revit - broken model no resembling original.

Has anyone developed a workflow or know a good way to achieve a stable DGN to Revit workflow maintaining most of the original integrity without bugs etc.?

Thank you!