I finally figured it out. the users_update.php in the root of the site would work. The one in a subdirectory would not. The problem was line 51 in the update file I attached earlier. I had to update it to 'UploadFolder' => "../cust_image/", instead of 'UploadFolder' => "cust_image/",
I'm really hoping this is the last time I have to bug you with this!