My guess is that (1) I have never fully achieved the ideal top of backswing position and/or (2) I'm starting the downswing incorrectly. The only shots where I feel what I would call 'no effort' is when I hit a chip or half-power pitch, ie, shots where there is no concern about distance. On full shots, I feel as though I am driving my legs and the whole upper body is pulled down as a result of that drive. For a full shot, it feels like more effort than just a 'turn' back to the address position. Common sense tells me that a 'drive' or 'thrust' (vice 'turn') of the legs would pull the upper body down with more force (some might say faster) with which to apply to the ball. Perhaps I am wrong about that.
Quoting Mindy, from GSotF, he wrote about the downswing: "It is instinctive for the legs to start the downswing. Both knees move toward the target." Perhaps the key word there is 'move'. He didn't say 'drive' or 'thrust', rather, simply 'move'. It almost implies (though not quite) that a 'move' by the knees sets in motion a tightly wound-up body, that only needs a trigger, if you will, to set it going into a downswing, sort of like a spring action. However, Blake makes it clear that the downswing is, in fact, a 'dragging' action, not a triggering action--instead the upper body is actually being pulled down by the legs. Again, quoting Mindy from GtTB about the downswing: "It is actually a downward drag which is a combination of two movements-- a horizontal rotating movement, led by the legs, which drags down the hands--and  is the backswing in reverse." In this instance he didn't say anything at all about the knees moving toward the target, rather that it is a 'horizontal rotating movment, led by the legs'. He didn't even say what the legs should do, only that they lead. But all they really can do is push toward the target as he more clearly stated in GSotF. This pushing of the legs causes the hips to move laterally [horizontal] and turn back [rotate] to their address position. He gave no hint as to how forceful this horizontal rotating movement should be. I think what you are saying is that the horizontal rotating movement should feel like you're turning to speak with a dinner partner (hardly any force).
I do get a feeling of dragging in most of my shots--that's not difficult. But to hit a full shot, to apply sufficient force, I feel as though my legs need to 'drive' or even 'thrust'. Perhaps this is why I've never been able to develop a truly repeating, reliable swing. What do you do when you're trying to get just that bit of extra distance (e.g., to hit over a hazard)? Thanks, Jim