does the LTM (rev 10) decompress (and then either recompress or pass the uncompressed traffic) the compressed HTTP traffic for standard servers by default? i do not think bigip decompressing the compressed response from server.
Since HTTP compression on the server prevents the BIG-IP system from reading the data stream and performing the intended replacement, you may need to configure the HTTP profile to remove the Accept-Encoding header in the request to prevent compression by the server
sol8115: Overview of the Stream profile
http://support.f5.com/kb/en-us/solutions/public/8000/100/sol8115.html
when enabling compression in http profile, i understand bigip will remove Accept-Encoding header, so response from server should be uncompressed.
sol3393: Overview of compression settings for the HTTP profile
http://support.f5.com/kb/en-us/solutions/public/3000/300/sol3393.html