OK, once the Umik cal file loaded the correction is shown on response graphs like in mine below. Is the black cal line my new "flat response" line if you will. In other words if my response happened to follow it as it rolls off am I flat spl wise.
No, The mic Cal line just confirms the mic cal is loaded and what shape it was. You can turn it off. See the box in the main graph legend.
The yellow measurement line includes the correction for the mic so it represents the true response of that measurement.