One point, why the hive 1 search feature was so comfortable and seemed to be more realiable is also the fact, that we were not redirected to a new page. Instead, one could search everything from the panel to the left. Maybe you can include the search engine somehow next to the filters? Then it would be as convenient as before.
Also, in hive 1.0, I just typed in keywords like 20 times because it was really perfectly convenient with the results coming up and the possibility to directly search again while having the results right next to it. It felt so open and reliable, while a new page creates this illusion of non-transparency... I dont know, I dont find the right words maybe.
But I think, Xenforo does not allow you to do this, right? Well, if there is any workaround to enable this convenience again, I think it would be worth it, because the resource sections and especially the outstanding convenience of the search engine was one of the hive's main outstanding advantages over all other modding sites I knew.
Hive was always the most convenient and open site .. Since the search engine changed, I almost completely stopped to just search the resources for fun, which I did back then sometimes.. Even if the search algorythm is completely the same or even improved as you said.