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Have you tried adjusting the settings from the options bar. You first select the brush tool and when a tablet is correctly installed you should see the air brush and brush dynamic options (highlighted blue on image below). Try experimenting with the settings otherwise go to the Wacom control panel.
Try dragging tip feel towards soft. See if that makes a difference.
Do you have a Details button? Normally there is a Feel Dialog which gives a graphical representation and shows thickness of pen stroke based upon chosen sensitivity and threshold settings.
NOTE: detail settings will be overridden by tip feel/eraser feel settings. So try and get the detail/feel dialog correct first and then adjust tip feel only if necessary.