Make Sure your PH is higher than 7 when feeding cal mag in soil, fastest way to deal with magnesium issues is a leaf spray with cal/mag ph 6.0-6.2 EC0.3 you can spray up to 3 times a week, both sides of the leaves, most gets absorbed through stomata, most efficient timing is always shortly before lights out. Do you use tab water? RO would be best, calcium levels in tab water are high wich can lead to disbalance locking out magnesium