Dynamic compression doesn't seem to be used in IIS 7.5

I currently have both static and dynamic compression configured. The static compression is working, however the dynamic compression, when checked through YSlow and Fiddler, is not working.

In my applicationHost.config, I have the following settings:

<urlCompression doStaticCompression="true" doDynamicCompression="true"
    dynamicCompressionBeforeCache="true" />
<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files"
    maxDiskSpaceUsage="100" minFileSizeForComp="256">
    <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll"
        dynamicCompressionLevel="1" />
    <dynamicTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="message/*" enabled="true" />
        <add mimeType="application/x-javascript" enabled="true" />
        <add mimeType="*/*" enabled="true" />
    </dynamicTypes>
    <staticTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="message/*" enabled="true" />
        <add mimeType="application/x-javascript" enabled="true" />
        <add mimeType="application/atom+xml" enabled="true" />
        <add mimeType="application/xaml+xml" enabled="true" />
        <add mimeType="*/*" enabled="true" />
    </staticTypes>
</httpCompression>
<serverRuntime frequentHitThreshold="1" frequentHitTimePeriod="01:00:00" />

My web.config has:

<urlCompression doStaticCompression="true"
    doDynamicCompression="true" dynamicCompressionBeforeCache="true" />

The modules are installed, and when I use the Failed Request Trace, I get a couple dynamic compression hits, but nothing about success or failure. Just these types of results:

ModuleName DynamicCompressionModule 
Notification 536870912 
fIs