Tenho um site http://www.antiprotecao.com.br, se analisarem com o firebug, mostra que, apesar dos arquivos do site terem um EXPIRES no futuro, parece que eles carregam todas as vezes diretamente do servidor a cada acesso. Segue as regras do meu htaccess:

#Definir Expires para os tipos de arquivos

<ifModule mod_expires.c>
 ExpiresActive On
 ExpiresDefault "access plus 7 days"
 ExpiresByType text/html "access plus 7 days"
 ExpiresByType image/gif "access plus 7 days"
 ExpiresByType image/jpeg "access plus 7 days"
 ExpiresByType image/png "access plus 7 days"
 ExpiresByType text/css "access plus 7 days"
 ExpiresByType text/javascript "access plus 7 days"
 ExpiresByType application/x-javascript "access plus 7 days"
</ifModule>

#Definir Cache para os tipos de arquivos

<ifModule mod_headers.c>

 <filesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|swf|css|js|xml|txt)$">

Header set Cache-Control "max-age=604800, private, must-revalidate"
Header append Vary Accept-Encoding
Header append Vary User-Agent env=!dont-vary

 </filesMatch>

 <filesMatch "\.(html|htm|php)$">

Header set Cache-Control "max-age=1, private, must-revalidate"

 </filesMatch>

</ifModule>

desligar expires e cache quando for arquivos PHP

<FilesMatch "\.(php)$">
 <IfModule mod_expires.c>

ExpiresActive Off

 </IfModule>
 <IfModule mod_headers.c>

Header set Cache-Control "private, no-cache, no-store, proxy-revalidate, no-transform"

 </IfModule>
</FilesMatch>

Ativar compressão GZIP

<IfModule mod_deflate.c>
 <FilesMatch "\.(js|css|jpg|png|gif|ico|php|html|htm)$">

SetOutputFilter DEFLATE

 </FilesMatch>
 AddOutputFilterByType DEFLATE text/css text/javascript application/x-javascript text/html text/plain text/xml image/x-icon
</IfModule>

<IfModule mod_headers.c>

Header append Vary User-Agent env=!dont-vary Header append Vary Accept-Encoding Header unset Pragma Header unset ETag </IfModule>

FileETag None
AddDefaultCharset UTF-8

Existe algo de errado na forma como estou fazendo o cache?

Obrigado