I'm slowly finding the launch trick is to be at exactly the right revs when you get the green light/flare/whatever. About 3.5k seems ideal on a few cars.
Yeah the CCXR is a beast. I tweaked it again to beat the time you got. I'll have to see about syncing it again. I imagine you'll squeeze another few seconds out of it.
Teamspeak is fine. I mean 10 minutes or so when I say a few. I've got a Turtle Beach (Earforce X41) that is meant for the 360 but I've got it hooked up to my HTPC atm. I'd just have to swap the optical input from the PC back to the 360 for the game audio. Chat audio is already setup to the PC and Teamspeak should be setup.