Feeling #3 Try This Out . . .
 

Try holding the club in your right hand as if you were going to cast a Zebco. Like this . . .



You will feel the "dead weight inertia" layin' heavy on your right forefinger. Now just assume a turned golf posture from here and cast LOAD right into the ground.

A bit too much wrist action for "swinging", though.

I prefer a hitters motion when fly fishing ;)

Tricky figuring #3 out for a swinger - at the top the right hand is turned on plane I tend to loose the pressure point.
I like to take the end of my right index finger off the shaft while practice swinging. IF your left arm is karate chopping you must focus on extend/push the right arm to maintain #3 pressure.
Any useful ideas on how to teach this crucial #3 feel?

All I'm saying here is if you just take the club and hold it in your right hand in a vertical plane like throwing a javelin, you'll feel the deadweight of the sweetspot laying strongly on your right forefinger.

Once you feel what it's like then just drop it on the inclined plane and take the load down.