that would be cal/mag deficiency.
I will bump up the cow mag see if that helps just was curious about the pH going in at 6: 5 coming out call off flush at 5.5 strictly water on the flush got some sledgehammer thinking about trying that possibly
your drainage ph is telling me that the ph of your soil is too low. flush with 2 x times the amount of water as the container holds. ie… a 2 gallon container flush with 4 gallons of ph’d water. I would ph my water to around 6.0. you made need to add bicarbonate lime to the soil to raise the ph of your soil