[Plugin: WP Super Cache] Gzip not working?

Well Gzip does run, but soemhow several files including .js and .css are not being gzipped. Some files are syntaxhighlighter files others are just simple files like a theme master.css file. Any ideas why?

With extra gzip rules

Gzip
RewriteEngine on
#Check to see if browser can accept gzip files. If so and we have it - serve it!
ReWriteCond %{HTTP:accept-encoding} gzip
RewriteCond %{HTTP_USER_AGENT} !Safari
#make sure there's no trailing .gz on the url
ReWriteCond %{REQUEST_FILENAME} !^.+\.gz$
#check to see if a .gz version of the file exists.
RewriteCond %{REQUEST_FILENAME}.gz -f
#All conditions met so add .gz to URL filename (invisibly)
RewriteRule ^(.+) $1.gz [QSA,L] 

# If they accept gzip and there isn't one - make one
<IfModule mod_gzip.c>
mod_gzip_on Yes
mod_gzip_dechunk Yes
mod_gzip_keep_workfiles No
mod_gzip_can_negotiate Yes
mod_gzip_add_header_count Yes
mod_gzip_send_vary Yes
mod_gzip_command_version '/mod_gzip_status'
mod_gzip_min_http 1000
mod_gzip_minimum_file_size 300
mod_gzip_maximum_file_size 512000
mod_gzip_maximum_inmem_size 60000
mod_gzip_handle_methods GET POST
mod_gzip_temp_dir /tmp
mod_gzip_item_include file \.html$
mod_gzip_item_include file \.php$
mod_gzip_item_include file \.pl$
mod_gzip_item_include file \.rb$
mod_gzip_item_include file \.py$
mod_gzip_item_include file \.cgi$
mod_gzip_item_include file \.css$
mod_gzip_item_include file \.js$
mod_gzip_item_include mime ^application/javascript$
mod_gzip_item_include mime ^application/x-javascript$
mod_gzip_item_include mime ^text/.*
mod_gzip_item_include mime ^httpd/unix-directory$
mod_gzip_item_include handler ^cgi-script$
mod_gzip_item_include handler ^server-status$
mod_gzip_item_include handler ^server-info$
mod_gzip_item_include handler ^application/x-httpd-php
mod_gzip_item_exclude mime ^image/.*
</IfModule>

and WP Super Cache I still have seven files that are not compressed. That is either because my rules do not work an or because WP Super Cache does not compress them. I am still talking about the same files which are loaded in posts like the one mentioned in the first post in this thread. The files in question are:

* wp-content/themes/d3/stylesheets/master.css
    * /wp-content/plugins/syntaxhighlighter/syntaxhighlighter/styles/shCore.css?...
    * wp-content/plugins/syntaxhighlighter/syntaxhighlighter/styles/shThemeDefault.css?...
    * wp-content/plugins/wp-slimstat/wp-slimstat.js
    * wp-content/plugins/syntaxhighlighter/syntaxhighlighter/scripts/shCore.js?...
    * wp-content/plugins/syntaxhighlighter/syntaxhighlighter/scripts/shBrushPhp.js?...
    * wp-content/plugins/syntaxhighlighter/syntaxhighlighter/scripts/shBrushPlain.js?...
    * https://zulu.tweetmeme.com/button_ajax.js

Did another test and found out I do have mod deflate enabled, but not gzip enabled. Too Bad WP Super Cache works with Gzip and that Yslow checks for Gzip only.

Working now. Had to wait a bit and empty cache. Yslow recognized mod deflate and I have also improved expire headers. So the last remark that Ylos does not work with Mod Deflate is hereby dropped ??