What version of SE are you using? The translator has changed over the versions so pin-pointing a workflow that will help you is dependant on the version you are running.
The other hint is to look in your SEACAD file (the config file used to control translation options). (I apologize for not remembering the file extension.) After making a copy of this file for backup, open it in notepad. Trial and error until you get the right settings.
Note: This file gets modified when you use the import wizard. When you select open, highlight the dwg file to open. DO NOT DOUBLE CLICK OR TAP OK. With the dwg file selected, click on options. This brings up the import wizard to play around with settings. Not all SEACAD file settings are controlled by the wizard, but most are. That's why you may have to open the SEACAD file to tweak it.