You haven't said if it overexposes, underexposes, or is inconsistent etc?
What does a histogram look like if you photograph a blank wall or sky? Where is the peak of the histogram? I know this is the opposite of high contrast, but it's the starting point for seeing if you are getting over or under exposure. The histogram peak should be just to the left of center by the way although I'm sure there are those who will want to argue about its exact position. If the histogram peak is to the right of center then even a flat image is overexposing, though you might not notice. A contrasty subject with the same settings would undoubtedly show blown highlights.
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