I have not seen anyone post the solution to your problem so it might be worth investigating ZoomSearch.
How to intergrate it into Rh is described on my site. ZoomSearch has various options to weight results far more than you can in Rh. You might consider having two search buttons, one labelled Recommended and one labelled Other, which access search results where you have applied different weightings.
See www.grainge.org for RoboHelp and Authoring tips