1. So you have to stop the hip sliding in the backswing, this is good, dont slide hips back, but turn the torso and upper body, therefore the weight is shifted to the right leg (back leg), understood !!!
2. At address, you position at the reverse K position, this is easy to understand.
Next point which is problem to understand for beginner, is the correct impact position with driver
"keep steady head" is the advice that is given to beginners...
"keep head behind ball is advice to beginners...
"keep arms forward to maximize lag is advice to beginners"
"don't reverse pivot is advice given to beginner"
3. How is it possible to shift all the weight on the front foot, when you keep bulk of the weight actually behind the ball (keep the head behind ball, human head is actually quite heavy weight, and it can be difficult to balance yourself this way)
4. How much spine tilt is correct for impact position with driver ? (imagine the spine tilt being left to right, as though you're looking face-on at the player)
spine tilt left is upper body towards back leg. Spine tilt right is upper body towards front leg for the purpose of the face-on perspective.