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I'd not worry about it unless it's lead based paint.

Calcium uptake is also greatly affected by pH and temperature. Someone with good agricultural experience (And I definitely don't claim that) can look at the plants, and tell what nutrients are lacking, based on the way the plants are growing, and the color of their leaves. I can say that when...

Magnesium sulfate.

In the mean time, after taking those soil samples, you can put on a good balanced fertilizer. You might even want to do a foliar spray of miracle gro, or a similar brand. You could add some epsom salt to that, about 1 tbsp/gallon of water, and you should see things perk up.