WP Super Cache compression not working [closed]

Question

I have WP Super Cache installed, and compression is turned on.

However, both GIDZipTest and Google Page Speed Insights Chrome extension say that compression is not enabled.

I added the following to my .htaccess file, and they still say compression is not enabled:

AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/xml
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE application/xml
AddOutputFilterByType DEFLATE application/xhtml+xml
AddOutputFilterByType DEFLATE application/rss+xml
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript

UPDATE: I have since disabled WP Super Cache, and I'm testing W3 Total Cache.