Well stop. Theres no reason for those spots on the leaf. Something your doing to the leaves is causing them. I dont like foliar feeding or spraying because of this reason. If you dont have mites id stick with just the neem as a preventitive every two weeks, (thanks for reminding me), and add your silica or whatever that other stuff is through the roots, and if you cant then just stop using it. Plants grow fine without it lol.