A pH over 7 is not good at all.... what you're seeing is a calcium deficiency which was probably caused by the pH problems BUT I notice that you've also said something about giving them more P & N? You don't indicate what nutes you're giving or the amounts but a nitrogen toxicity will also cause a calcium deficiency. Plants in flower need less nitrogen that they need in veg so don't over do that nutrient... Add some calmag and definitely keep the pH down between 6.0 and 6.5.
Good luck....