Patriot I'm glad I could help and hope you are able to turn things around. I think I understand your questions so let me attempt an answer - if I misunderstand anything let me know and I'll try again.
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1. We seem to get long as a club(hands get away from us, back elbow actually leads the hands into the zone) do you teach to keep the hands near back shoulder? How would you solve, obviously the landing the plane drill would work? What else?
If I'm reading this correctly this sounds like casting of the hands. This is when the hands get too far away from the body and the barrell takes forever to get to the hitting zone. One of the ways to fix it is swing next to the net. Get about two feet away from the net (or slightly closer - you want the net to resemble the outside edge of a home plate). Have them take some cuts and if the bat hits the net then they are casting the hands. Have them make adjustments (should be able to figure this out on their own) to bring the hands in more and let them lead a little more. Obviously they don't want the hands hugging the body but they don't want to extend them too far away from the body.
Where you start the hands isn't as important because if you are casting the hands then they will get out there regardless. This is another area of comfort that will vary from player to player. Overall the quicker the hands the higher they can be but still want to be realistic where they start at. An area would be near the back shoulder and can adjust from there.
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2. How do you think a trigger should happen?
Not as clear on this one - are you asking what the trigger should be or when should it happen?
As for what the trigger should be it goes back to comfort. I always like a stride because that was what I was taught back in the day. I see the advantage of the lift / replace (similar to the stride in that the foot comes off the ground but comes back down in same spot) or the heel lift. Basically the trigger is a movement to help start the swing. Think of the philosophy of moving in order to move.
As for when the trigger should happen it's up to the hitter and how hard the pitcher throws. Obviously you don't want to be too late or you will be late on the swing but too early is tough because you have to hold back your swing. It's something that can be done but it's tough. A rule of thumb to start with is when the pitcher shows his hip you show him yours. Meaning when the pitcher reaches his balance point with his front leg up in the air he is showing his front hip to you. That is when you trigger.
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3. Shoulder tilt, I get it but how do you teach it. Fine line teaching?
The shoulder tilt should happen naturally when all the other things line up in the swing. But to check for it go back to the ABC drill and when they freeze check for it. If not there or not good enough then make the correction.
Best time to check for shoulder tilt is during the back side rotation. The back leg has to spin, twist, rotate in order to open the hips and generate power. When that happens the hands should start to drive or drop into the hitting zone. When that happens the shoulders should start to tilt on their own.
What I teach is the swing starts from the ground up. After the trigger the first movement should be the back leg rotation. There used to be an old saying "Squish the bug" to emphasize the point of backside rotation but it has lost it's coolness as a saying for some reason. Regardless of what terminology you use that leg has to start first because the next movement is the hips have to start to open. Then the hands start to drive / drop into the hitting zone. It should look like they are all moving together and if they do that's fine but I like the guys to have that sequence in their head to break down the swing by component. One thing I like about using this sequence is it can help keep the hands back when trying to hit offspeed / breaking pitches.
Not sure what you mean by "fine line teaching". Never heard that before.
Hope this helps again.