Hey J, when u say deeper arms and hands you mean kinda like soft draw takeaway?
I have to clarify some stuff that I thought it was real but it's not real.
First of all, a shoulder turn. What I thought a shoulder turn should be is exactly what it's not. A shoulder turn should be a nice coil like how you would throw a ball. Everytime I look in the mirror when I turn my shoulders i would have my shoulders turned about only 45 degrees instead of a 90 full shoulder turn. My arms just flies and wrap around my body. I then tried what manzella said a cross guard turn. Now this is a real turn. The shoulders don't turn it self, what I felt was just my shoulders rotating my arms, instead of turning my shoulders I was just turning or rotating my shoulder sockets. You can try different ways, like shoulder towards your right knee or right foot right heel whatever makes you feel like a real turn.
I had a really high hands before because my shoulder would only turn 45 degrees and then it would just go up from the momentum of the club. I really had enough with this, so I told myself before my round I'm just gonna open my left arm and then let it close. I mean it came clear to me, hey man if you gonna close that gap you would need to open it somehow right?
I probably played with the best consistency for the last 5 years. Every ball went dead straight. I could work the ball around, hooking, drawing, fading, slicing you name it. But around 18th green I hit some big fade following with a small cut with my 9 iron. I then realized I popped out my left arm a lot. Now if you pop out your left arm too early, your hands will be too far away from your body. Therefore you won't get as much speed on the downswing and probably have a hard time closing. Your hand path is really important, if you pop out too early, your hand path would be off. By doing lagging club head you would not pop out too soon. As for me, I just think of hands as deep as possible, it sets a better hand path for me. Brian had a drill where you put a stick next to your left foot and make sure your left arm will not pass that stick so you won't swing too far right. I think of putting a stick next to my right foot so my hands don't pop out too early.
The only reason that I changed from really up right to flatter is because my driver always hooks into the tree. I probably had the best iron plays with the upright swing but something's gotta change for my game so I did it.