I have and I do every feeding give it cal MAG
If there is too much N that can corelate with plant absorbing Mg/Ca/S with problems and PH swing is usually guilty
for these issues..
then plant first show those Cal/Mag problems.. but if N is too much then you need first flush what is never good
in flowering phase cause flushing in vegetative brings better results for plant and grower and its easier to
maintain damage... but if you go in flush then after you flushed give them balanced feed later with all
macro,micro and secondary element feed so they dont goes in shock,atleast 60-70% power of usuall
feeding.. dont ever goes strong with nutes after you flushed..
If they will goes in shock then you will still grow them and finish but maybe yellower than when growed optimum..