All right chowder, a couple things.
1. Foliar feeding is good practice if you know what you're doing. It is excellent for reversing individual nutrient deficiencies; I do it for Fe/N supplementation.
2. Neem oil is not just for spider mites. It repels many other types of insects, causes them to be unable to feed, and kills them. It also keeps some types of pests from completing their life cycles.
Neem is also a fungicide and fungistat, which means it can prevent and even cure fungal problems when used as a spray or systemic.
Furthermore, it is a leaf glossing agent and makes your leaves smoother and thus more difficult for mold spores to settle on.
Regular use of neem can prevent all sorts of bad things happening.

Easymack, your plant doesn't look as bad as expected. In fact, it looks wicked healthy. The foliar feeding seems to be working!