Today I hit 4 fairways at ~275 yrds each. So, I have found my problem: tension. Tension in the hands and forearms, which is caused by fear, which is caused by a lack of faith in my swing. So when I shut that down and swing loose and freely, life is good. The troubling thing with this is that I don't know specifically what is technically different about my swing under those conditions, which introduces some doubt, and I think that in pressure situations I'm still vulnerable. I need more knowledge of the physics at play to put my mind at ease and increase faith. I guess I'm a "feel" player.