I have found the error of my ways...

For the purposes of the archives, I'm posting what actually made this work. It is a very simple fix and I don't quite know how I missed trying this out during my frustrations.

Before the "ipfw fwd..." line you need one or more "ipfw skipto..." lines to ensure that you don't accidentally match the more specific addresses on the fwd.

What's interesting is that I'd had "ipfw allow..." lines before the "ipfe fwd..." line doing a similar thing to skipto, and it didn't work.

So I amended the ruleset to the following (other rules stay the same):

06000   515  153945 divert 8668 ip from any to me via em0
07000    48    5472 skipto 32000 ip from 10.81.0.0/16 to 217.65.161.4 dst-port 
80
07100     0       0 skipto 32000 ip from 10.81.129.0/24 to any
08000    94   10434 fwd 127.0.0.1,8000 tcp from 10.81.0.0/16 to any dst-port 80
32000   499  230890 allow ip from any to any

Paul.
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