Find in Alloy Template - modifying the unified search excerpt

I'm new to find and am struggling with the lack of full sample site to work on. 

I'm using the Find 13.0.1 and CMS 11.9.0

So I only really have the alloy findSearchPage to work with. 

I'm trying to figure out how the excerpt is being created, because it seems like sometimes it is grabbing fields all over the place depending on the template. 

I'd like to find out more about the Unified Search and how I can adjust the except to something more user frieldly.  I know I can do something using SearchClient.Instance.Conventions.UnifiedSearchRegistry,  But I have no where to impliment this in the alloy findSearchPage controller. 

Any advice on how I can work this in and adjust the except I could get will be very helpful

Thank you!