been feeding from the start, so it could be lockout. Try irrigating with pH 6.5-6.8 an extra cycle and see what happens.
always get 20% runoff / waste water. Wait for top 1" to dry and get familiar with weight of saturated and dry pot. if it continues, reduce frequency of ferts or dilute them. if you see any yellowing from bottom-up, resume fertilization, retain concentration of highest "N" part of ferts and maybe drop K a tad one way or another.