Hmmmm... that could be good, or that could be bad. (Thank you, Captain Obvious!)
Anyway, I'm always looking to get less fluid in the gray and more in the black when I'm without hookups. We often do the dishes in a dishpan in the sink, then dump the dishpan into the toilet. More water in the black is good, as it keeps the solids moving when dumping. Less water in the gray is good because we tend to overfill the gray with showers.
Whatever, it might have been nice if they had told you that little detail in the owners manual or during the delivery...
2014 RAM 2500 Laramie 4x4 Quad Cab w/Cummins Turbo Diesel, 2009 Rockwood 2607, and 3 'yaks!
300W of Suntech Solar, a Rogue MPT-3024 Controller, and a Xantrex PW2000 Inverter