Tks Coach George for your explanations-esp the importance of practicing the drill with crook of elbow just above the waterline. As the elbow is raised slightly (to drag wrist and then fingers), the drill becomes easier.
Will try to think about weight shift more than moving arm fwd.
You have to admit that in some ways the old zipper drill was easier to understand--bring hand up along your side--definitely something tangible. This business of "gripping the water" or holding the water and releasing the water is harder for me to grasp. But just having come off a shoulder injury, I do understand the importance of being relaxed. Its just a little harder to put into practice.
But I do thank you for your explanations and it does make it more clearer.