Cal/mg def

started with tiny yellow and brown spots on fan leaves after stupidly re potting after sexing now growing dead areas on fans with curling and yellowing leaves. ph level sky rocketed to almost 8. im flushing but i cant find cal/mg nutes at area stores. i bought epsom and crushed a dozen egg shells hoping to detour. i even bought calcium citrate and mg with zinc vitamins from the health food store. should i try any of these. im almost in week five of flower

ride the storm, no fixing them now, only 3 weeks till harvest so dont worry. loads of leaf will fall, most leafs will dry up like sandpaper, but bud production will carry on .