5110cn Print Quality

We just got a 5110cn to use along side our 3100cn for printing presentations and reports. So far I am very disappointed with the output of the 5110cn compared to the 3100cn. Even at the "High Quality" setting, the 5110cn's output is weak compared to the 3100cn's "Normal" setting. Images and charts appear washed out and colors are less vibrant. I've toyed with many of the settings with no luck. Can someone recommend some settings to improve output or am I just wrong to expect the same quality that I'm getting from my 3100cn? Thanks for any help! Sincerely, Ken