I haven't tried it, but maybe you want

use Encode;
...
my $name = decode('UTF-8' => $cgi->param('name') );
[download]

etc... in order to properly have the parameters decoded.  There's also a related CGI.pm option (pragma) "-utf8" ("This makes CGI.pm treat all parameters as UTF-8 strings."), but be sure to read the note in CGI.pm's manpage.

The -charset=>'UTF-8' you already have will only have an effect on what's being sent to the browser on output, and the use utf8; only tells Perl to interpret the script source as UTF-8.