Kaboom microgrow

Hi there, I think you have nutrient burn and calcium lock out .As you are using a decent amount of nutrient, there is small possibility for deficiency. Have you been checking your run off pH and ppm regularly?If not, check both run off pH and ppm(EC).Maintain your soil pH around 6.5 for both in and out.Also check ppm(EC) whether it is too much different or higher than what's in.Try to avoid Nitrogen rich nutrient during this late flowering stage.Good luck and happy growing... ✌️