How do I get good video quality?

I can't seem to get more then 20 fps and not so hot video out of iChat AV. With what should be pretty good connections, I still get stopping or pixelation at times, so I've been trying to isolate the issue.
Conferencing over an airport on an in-house system for a test, with 2.4 megs of pipe (showing in Connection Doctor; other tests show 10 megs up and down) using either iSight or a DV camera, I get 20 fps, no more. OS 10.5.3 on both sides, Quicktime 7.5 on both sides. Intel Duo 2Ghz with 1 Ghz ram on one side, G5 with 5 gigs of ram on the other. One way video chat. No other apps running. No other traffic on the Airport.
We're trying to use this for student "live shots" over the internet. The quality of the video frankly used to be a lot higher with earlier versions.
I don't get it. If it is possible to get 640 X 480, 30 fps out of this, I can't figure it out. Hopefully, one of you will know how to do it. Do I need to install Quicktime Pro? Is there some magic button or setting somewhere? (yes, i is set on LAN) Do I use another application that has low latency like iChat AV but better video quality? Is there an appliance that will do this better? Is there a way to set up a point to point conference? (Quicktime Broadcaster allows this, but has long latency... too long to be usable for our purposes.)
So I'm not getting why I can't do this. Please let me know if you have any ideas.

Ralph,
Thanks. I've increased the RAM size on both sides, have a blazing fast connection, and use prosumer cameras with good glass and lighting. The boxes on both ends are dedicated to this with nothing else running. I've even met with our campus IT lines to make sure there are blocks or plugs on ports. No good.
I guess its in the CPU or something. It's a bit annoying. I'm a really big fan of iChat. We've used it for "live shots" on election night and as broadband field "live shots" over a 3G telephony connection and wireless broadband. Nothing else we've found is better. It just seems to handle video quality less well in the last couple of versions.
If anyone knows the magic formula.... X- machine, X-plug in, X-external box, X-side processor, I'm interested.
Thanks for your suggestions.
David

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