It's so true what you say, Kevin. It's all psychological. I still suffer from constriction from time to time as my mind gets in the way and my body interprets the coming note as a "high note". If I remember to step back and use my prominent leg and backside muscles on the higher frequency, it tends to help a great deal as it takes my mind off the "high note" and mentally changes it to what it really is: tilted T.C and thinner chords. The results are amazing once I remember to take the thought of the high note out of it.