Indesign fitting image after placing

I've gotten pretty far with using frame fitting options on image frames that are "loose" on a layout. But for image frames that are anchored in text is where I am failing, though Indesign does not present an error.

I start with a document with some text. And I anchor a labeled image frame into a certain point in the text.

I can place the image, but scaling and the frame fitting options just don't do anything that I can tell.

set imgValue to "Assets:Signatures:AC_Vierra_sig1.tif"

tell application "Adobe InDesign CS4"

     tell document 1

          set allRect to (every rectangle of every story whose label is "CS46Signature")

          if (count of allRect) > 0 then

               repeat with thisRect in allRect

                    tell thisRect

                         set fitting alignment of frame fitting options to bottom left anchor

                         place imgValue

                         redefine scaling to {1.0, 1.0}

                    end tell --ax

               end repeat --drill down into img frames in text

          end if --allRect not empty

     end tell --theDoc

end tell --app

I've tried different combinations of these and they fail without error. What would you do given anchored image frames? thanx, sam