When I first started to try and cure a slice,I could'nt figure out what was wrong.It's very frustrating,as you think your doing everything right.
I decided to look at what club I was always exceling at.
To be fair I have always been good with a P/W.I often have comments about how confident and well executed it looks.
I remember the great instructor John Jacobs saying there are 12 or 14 clubs or whatever,but only one swing.
However I though my technique with the Wedge was actually a pitch using a shortened swing with an early wrist break.That's not a swing I thought..Not for the Driver,the Woods and the other irons.
I was wrong ! In fact everything I was doing with the P/W were considered essentials in the full swing.My feet and legs felt active.By hip height my wrists had cocked,and the club was in front of me and was about 90 degrees to my forearm .My left forearm had rotated, and the back of my left wrist was facing front.
As my arms went a little further,my shoulder turned naturally.Using my P/W I always felt active from the hands to the feet.
At the top of the backswing,a slight pause then,a perfectly timed release with the classic lateral move of the hips leading a perfectly timed contact and release of the clubhead.
If you want to know the essence of timing,simply read Leslie King.His explanation of timing will surprise you.
If I now get any problems with my driver,woods and Irons in terms of slices,pushes and pulls,I just go back to my P/W Action.And swing like that prior to using the other.
The only qualification would be a slightly quieter action of the legs,but that's all.
Get this action with the P/W and then apply it to the longer clubs.The swing will be more compact,more under control,but the co-ordination of the lower and upper body with late release of the clubhead through the ball will lead to more power and greater direction.
It's what helped me.It might be useful for you.