is color control turned OFF in your printer setup? I don't have a Mac so I cannot tell you the exact settings. On Windows its called "Mode", it starts with a pair of radio buttons, you select "Custom", then a drop-down you select "Off"
did you run a Nozzle check on the printer to check that all nozzles are working?
is your monitor color calibrated?
do you have the correct printer profile for the 2880 and the paper you are using?