Sweep
Journeyman Pro
Unfortunately you don't seem to be getting a good range of distances by using this "gripping down" method as many of your grip down figures are the same as the grip up figure on the next club up.
What is it you can't do in the clock-face method? Is it backswing or through swing? Are you trying to keep your through swing the same length as your backswing (e.g. 9 o'clock back 3 o'clock through)? If so try going back to the desired position but swing through to a full finish. This is recommended by Dave Pelz as it ensures no deceleration through the ball and gives more consistent yardages.
What is it you can't do in the clock-face method? Is it backswing or through swing? Are you trying to keep your through swing the same length as your backswing (e.g. 9 o'clock back 3 o'clock through)? If so try going back to the desired position but swing through to a full finish. This is recommended by Dave Pelz as it ensures no deceleration through the ball and gives more consistent yardages.