I sat and thought about it.. you do not mention to update the member stat after changing these entries... this is required to make it work properly when changing the email address etc...
there was another "hack" that mentions it as follows:
$vars_wordlets{email_field}:
$public_name: Please note, Changing this does NOT Check for duplicate $vars_wordlets{email_field}.
You should rebuild member stat files after making this change to update emailfile.cgi(in Members)
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