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CSS11501 - outbound RPC traffic

I have a CSS11501, and some AIX servers inside the server farm, wanting to do RPC calls to outside the farm, through the CSS. I have configured services, content rules and source group, and most things are fine. BUT RPC calls from AIX tend to use a source port lower than 1024 (it chooses an unassigned port, but not from the ephemeral range). The CSS does no port translation on this, and consequently (it appears) does not route the response packet back to the correct server. Personally, I think this is a fault in AIX making a poor choice of source port, but can you suggest any way I can (a) persuade AIX to use a sensible (ephemeral) port, or (b) get the CSS to do port translation for sub-1024 port numbers?