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Try Preferences>Appearance of Black>Output All Blacks as Rich Black
I have had the following Preferences set:
On Screen: Display all Blacks as Rich Black
Printing/Exporting: Output all Blacks as Rich Black
and have also checked to activate:
Overprint [Black] Swatch at 100%
Are you sure it isn't just printing using 100% Black ink only? That would look gray next to a black in a photo, for example. Have you used a maginifier to check?
all colors print a weak color (black is grey etc.)
I just noticed you said all the colors are off, so it's probably a color management/profile problem. What happens if you export the ID file as a PDF/X-4 pdf and print from Acrobat?
The PDF prints a solid black proof on both printers.