Portable OOo 2.0.3-de: Need some hints for compression

I have tried to compress OOo-2.0.3-de(RC7) with UPX and 7-Zip. The files on the USB-Stick are 20 MB bigger than the former version. I run UPX with the options on the support-page of portableapps.com. The original archive of OOo-2.0.3-de is also 3 MB bigger than 2.0.2, but not so much. Is there any hint to compress the zip-files in OOo in a better way? What about the .net-dll. Are there a program to make them smaller? Thanks for any hint.
I hope, PortableOOo-de-2.0.3 could be released in more smaller form at the same time as OOo-2.0.3-de-local. If there are no way to get it smaller, I will release it as it is today (zip: 98,4 MB, unzip: 195 MB).

Regards,
Andreas