I'd be very interested to see what results you get. I've just this second finsihed training another one and it's even worse after training it! I'm using one of these labtec mics. It's so bloody frustrating.
Clearly after watching Johns demo video he's got it working well, so it is possible. Although I'm hesitant to drop £50 on a microphone when I can't get speech to work whatsoever in a silent room with a halfway decent mic.