I found this interesting, observe below... either way it appears either to be calcium/manganese/magnesium... which?... since calcium/magnesium can run hand in hand, and manganese def's appear with high PH levels.
Deficiency Symptoms
Because Mn is not translocated in the plant, deficiency symptoms appear first on younger leaves. The most common symptoms on most plants are interveinal chlorosis. Sometimes a series of brownish-black specks appear in the affected areas. In small grains, grayish areas appear near the base of younger leaves. Manganese deficiencies occur most often on soils with a high pH and/or naturally low Mn content. Conifers will exhibit a general yellowing of the current season's needles.
Toxicity
Manganese toxicity is a relatively common problem compared to other micronutrient toxicity. It normally is associated with soils of pH 5.5 or lower, but can occur whenever the soil pH is below 6.0. Symptoms include chlorosis and necrotic lesions on old leaves, dark-brown or red necrotic spots, accumulation of small particles of MnO2 in epidermal cells of leaves or stems, often referred to as "measles", drying leaf tips, and stunted roots. Sometimes the interveinal tissue will show "puckering" or raised areas in the leaves. Toxic symptoms can sometimes be alleviated by using Iron chelates applied to either the soil or preferably the foliage. Some acid-loving plants such as blueberries, cranberries, Christmas trees, azaleas, etc. may accumulate very high levels of Mn in their tissue due to the required low soil pH. However, these plants normally will tolerate much higher tissue Mn than other species.
It appears your PH is stable but had to be skewed to be developing the symptoms. Best course of action is to "keep" your PH stable and apply "ALL" nutrients at modest amounts, your plants will then improve.
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