James,
Sounds like you and I have had very similar experiences.? Have you tried MULTIPLE packet clients with all pointed to port 9000?? Just wanted to confirm that the proxy software is robust enough that it can handle the multiple requests.? Probably no more than 2-3 at a time due to bandwidth limitations on 1200 bps, but still better than just "one at a time".
Best Regards,
Jeff Scoville
AE5ME