Photoshop :: Epson Scan's Color Configurations Convert Profile Feature

I read the Photoshop Windows (read only) thread, titled "Scanning old photos", at [URL]......... I found Robert Shomler's answer useful, even though I am using an i Mac. 
 
I have been using Epson Scan Version 3.01A and the Epson Perfection 4490 Photo scanner to scan reflective photos for over three years. I started using Adobe Creative Suite 6 Design Standard, and Photoshop for the first time, last month. My iMac is about one year old, and System Preferences shows its Display profile as i Mac.  
 
I am befuddled by Epson Scan Version 3.01A's Color Configuration settings. I believe that I've been using the default Color Control, Continuous auto exposure setting for all these years, accept that I apparently changed Display Gamma from the default of 1.8 to 2.2. 
 
I tested scanning the same originals with both the Color Control setting, and the ColorSync, Epson Standard, Target sRGB setting, as TIFF's. The resulting TIFF's look radically different in color, when displayed with Preview and Photoshop. The images resulting from the ColorSync, Epson Standard, Target sRGB setting more closely resemble the originals, except they appear to be a little flat. 
 
At the moment, I have the Photoshop color working space at sRGB IEC 61966 2.1. When I open one of the scans done at the Color Control setting, select Assign profile sRGB IEC 61966 2.1, and check "…convert document to working RGB", I don't see any change in the color. The color does not change to look like the scans done directly to sRGB IEC 61966 2.1. Is that right? 
 
I notice there is also an option to Assign profile Epson Perfection4490 - reflective. When I try this, the color changes to something different from both of the aforementioned test results.