You need low hands at P6 (half-way down) ... agree with the hip rotation bit. However, I use extensor action at the top and then simply turn thru the ball with the torso ...arms are like thick ropes that whip thru impact with a bowed left wrist and flexed right wrist. Hands are ahead of ball at impact due to your bump left and hip turn ...not a purposeful thrust of the arms forward. I do have a thrust element to my swing ...this is created by the diagonally upward push of right big toe and the vertical upward thrust of the left knee (parametric acceleration) ..if timed correctly you get massive flash speed thru impact