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What adapter do you use?
And 1920 x 1080 pixel on a 27" might not really look that good, as other displays of that size go up to 2360 x 1440 pixel.
 
You have MirrorDisplays unchecked?
System Preferences > Displays >> Arrangement >>> Mirror Displays (but know, that the display with the lowest resolution determines the maximum resolution used on both, thus one display will have a lower than native resolution, except when both displays have the same native resolution)
MR_mirrordisplays.png

Have you looked at SwitchResX yet?
 
You have MirrorDisplays unchecked?
System Preferences > Displays >> Arrangement >>> Mirror Displays (but know, that the display with the lowest resolution determines the maximum resolution used on both, thus one display will have a lower than native resolution, except when both displays have the same native resolution)
Image

Have you looked at SwitchResX yet?

Yes I do have mirror displays turned on. Ill adjust the setting when I get home and see how it looks. Thanks.
 
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