How do we make the AI search and Virtual Agent Now Assist work better?

We're currently looking at switching on the ServiceNow AI search and the Virtual Agent Now Assist and have run into some issues with how it performs with our knowledge and catalogue items. We've since worked out that it doesn't have the capability to read knowledge blocks within our articles which means articles are getting missed or the answer provided is wrong or only has partial information. With the hits for our catalogue items we don't always get the right one back or it returns a catalogue item instead of a knowledge article. AI search and Now Assist don't take into account meta which we've used to improve search in the past.

We found as a work around we've been able to improve search results by changing the headers and including more summaries, particularly where KBBs are used. We were just wondering how other organisations were going with these capabilities and if there's any tips to improve the results?