I'm working on the Terry Downs' Styles of Roy Nichols video and I'm having a bit of an issue. How does one go about chicken pickin'?!?! Do you palm mute? In the video he shows how he chokes up on the pick and says to allow the thumb to hit the string. That's all fine and dandy until I give it a go and it is pinch harmonic central even at low volume totally clean. Any help is much appreciated.