Hi!
You are very welcome.
1. Yes, you can change the mixed results order here. You want to drag the “terms” below “post_page_cpt”.
2. Well, sort of – but the relevance calculation is a bit more complicated than that. First, you probably want to try the index table engine, it is a really great feature. Second, using a strict primary + secondary keyword logic.
3. I am not sure if this requests is relevant to the search – as the live search is not indexed by google, their crawler bot does not do that. The results pages might be, but there the plugin has no effect, the titles are requestd from wordpress itself.