I just had a perl epiphany!
Be aggressive! Do this:

Assuming that the data to be written will buffer and then
be written to the file in a large chunk --> lock the file so that the FWall cant write to it.

o Wipe the file clean
o Release the lock
o Lock again
o Read file's contents (which have been written when you released the lock )
o Send the contents to syslog
o Wipe file clean
o Unlock again and repeat the whole operation

I think this should work very well.
-bl0rf