Staying loose

I played 15 holes of horrendous golf while imparting a mad slice on the ball today. For the life of me, I could not correct it. On hole 16, I made another terrible slicing tee shot. Out of shear abandonment, I walked up to my ball, with no practice swing / routine, and took a lazy, loosey goosey swing. WOOSH. Straight and true and onto the green. It then dawned on me that all day I had been so nervous and worried about my swings that I was clenching up and tightening the wrists / forearms during each swing. I hit a few on the range afterward and really launched some gorgeous balls. It is quite amazing how a lightness and tenderness in the golf swing produces truer flight and much more distance. Can someone explain to me what precise motion the wrists should take just before impact? Should the right wrist be turning over the left? Should the left wrist be bending back to fall in alignment with the left forearm? Any help is appreciated.

From what I've learned (and I'm sure others will either support or correct me)

There are 3 types of release: Push, Slap-Hinge, and Crossover. In all releases, impact should be a flat left and cupped right (for righties). However, I think that in the push release there is no active wrist action, in the slap-hinge the right hand starts to un-cup while the left starts to cup, and in the crossover the right is rolling over the left. But none of these happen so early as to have the left wrist broken down before impact.

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For the record, I'm a club doctor, not a swing doctor.