Ok so, we're talking about a 3kbps video. My suggestion is to start over from a fresh install, and you changes one at a time and loadtest. See where the problem occurs. I feel that it should hang even with the un-optimized server using just 4 cores.
Any error messages in the console/logs? Do you notices any strange memory/CPU usage?
If you can't get it sorted we'll want to see more info. You can zip up your conf and logs folder and send in an email to
email@example.com. Include a reference to this thread.
You can have 1 server instance and in [install-dir]/conf/VHost.xml you can specify a particular IP address or domain name, or set
HostPortList/HostPort/IpAddress to * and Wowza will listen on all the NICs. See the VHost.xml section starting on page 11 in the
Configuration Reference for more information.