To what FAA office or personnel should one direct an inquiry about the reasons behind the airspace design at a particular airport? The airspace design process is extremely complex.  See for example this FAA document, Order 7400.2M.

To what FAA office or personnel should one direct an inquiry about the reasons behind the design of the airspace around one particular airport?  

I'm seeking real-world, practical insight as to why the unusual airspace configuration we see at KACV and KTVL was selected, over the common configuration that we see for example at KONP and KCEC. 

I'm specifically seeking information about why the airspace was designed that way, not about how it is being handled now in actual practice by ARTCC etc.  

These two airspaces are rather unusual and it's unlikely that a satisfactory answer will be obtained just by perusing the FAA documents giving general guidance on how to design airspace to handle existing/ proposed instrument procedures, etc.  

However any kind of actual "paper trail" relating to the design of the airspace at these two particular airports could possibly be helpful, if it were not too "dense" to interpret -- how might that be obtained?

But I'd prefer to speak to an actual person, if he/she had some relevant insight on the design process for the airspace at either of these airports.

Although guidance concerning my specific case is most welcome, also I'm seeking an answer crafted in such a way as to be helpful to anyone seeking  to answer a similar question for any airport in any region of the nation-- how to go about locating an appropriate person or FAA office to direct such a query toward?
By reading your linked FAA Order and finding references for responsible offices and a little follow-on search, I found this link to the Office of Mission Support within the Air Traffic Organization.  

Airspace analysis appears to be within their purview:  


  Mission Support Services oversees the Air Traffic Organization’s
  activities in:  
  
  
  Aeronautical Information Manual (PDF)
  Aeronautical Information Services
  Air Traffic Organization Environmental Reviews
  Air Traffic Procedures Advisory Committee (ATPAC)
  Instrument flight procedures production/charting
  Metroplex
  New York/New Jersey/Philadelphia Airspace Redesign
  Obstruction Evaluation/Airport Airspace Analysis (OE/AAA)
  Performance-Based Navigation (PBN) Implementation And Usage Dashboard
  Pilot Web
  


They provide the following contact information:  


  Address
  FAA National Headquarters
  1028 - 10A
  800 Independence Ave., SW
  Washington, DC  20591  
  
  Phone: (202) 267-8261