I had a similair problem with trying to implement extensor action and feeling really tense, especially in the forearms, which would lead to a poor shot. What I found is that if I just focus on PP#1 then just feel me applying right tricep action pushing against PP#1 and straightening my left arm then the tension would go away.
Couldn't get the feeling very good with a club in my hand, but working with exercises Yoda gave me with using some streching material that you grip like you would a club, or just pushing while holding your left thumb really gave me the feel and I can monitor everything in front of a mirror. I will take address in front of the mirror, hold my left thumb then do all the major positions (startup, backstroke, at the top, start down, etc.) while making sure I was applying extensor and keeping my left arm straight. Once I got this down it was easier applying it to the club.
I'll do this a couple times a day when I get a chance...which is easy since you don't need a club to do it.
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