Zlib is enabled on Apache, but not compressing?

I have turned on zlib for compression, since my host would not activate mode_deflate!

I have edited the .htaccess and it reads the following:

php_flag zlib.output_compression on
php_value zlib.output_compression_level 6

AddHandler application/x-httpd-php .css
AddHandler application/x-httpd-php .html
AddHandler application/x-httpd-php .js

php_value auto_prepend_file /my/absolute/path/ct.php

php_flag short_open_tag off

Code (markup):

and the ct.php contains:

<?php  
 
$path = pathinfo($_SERVER['SCRIPT_NAME']);  
 
if ($path['extension'] == 'css')  {  
   header('Content-type: text/css');  
}  
 
if ($path['extension'] == 'js')  {  
   header('Content-type: application/x-javascript');  
}  
?>

PHP:

This is a wordpress blog, I have no idea why zlib would not compress! I used the ob_start('ob_gzhandler'); but it breaks stuff in the admin panel!

What could be the problem, I made a simple test.php to echo the php values on the server, says Zlib enabled, zlib.output_compression On, zlib.output_compression_level6, yet nothing seems to be compressed.

I have confirmed it via, YSlow, PageSpeed and that whatsmyip.org page