Can I ask why your shooting for such a low pH range for soil? 5.8 to 6.2 is lower especially if aiming for 6. You should be shooting for 6.2-6.5 with 6.4 really being the sweet spot… For as many people jumping in about deficiency but no one questioned the low pH? Classic example of lockout or partial lock out…
Of course he is falling off on calcium and magnesium, look at the chart and pH range he’s targeting, doubt he is getting good uptake of phosphorus either…