We always try different things in the same position. We need to change the position.
Sth has to come out-kua, sth has to disappear-shoulder. It is a pair. When we do moves, kua is always left behind.
Shoulder and hand need to be fixed, to move the elbow. We have too much shoulder and hand movements and the elbow is never engaged. When the elbow cannot come out, the hand and shoulder are squeezing the elbow into a dead corner. The elbow has to push the hand and shoulder apart. We need to realign things. Practical Method way of being smooth is proportional.