Ernest, thanks so much for taking the time to help us with this! Your advice has been awesome and we've been able to resolve 90% of our issues. Thank you again for the fabulous tech support!
The only bit that still wasn't really working is the taxonomy issue. We made sure to have the configuration you suggested ( https://i.imgur.com/C9IUshe.png ) but the search still wasn't working quite right. Just flagging in case someone else encounters this issue in the future.
Best wishes, thanks again, and we'll make sure to recommend Ajax to others!
Lidia and Katy