Thanks. Well, I had a couple of paragraphs typed last night and then my internet provider suffered and attack and we've been offline ever since.
I think you are correct about the torquing, but I am not sure about the cause or the cure. I have begun shooting only at 10 yds and less, and have concentrated on form. Elevation is now right on, but still about 6 inches left.
Asbell says in his book to grip a longbow with force and his illustration shows more of a grip on the side of the bow. He describes a heel down grip, as opposed to a thumb/forefinger grip (which you suggest, and with which I've always had good luck on with pistol gripped recurves).
I'm going to keep experimenting until I bring it over. I'm open to the rest of your reasons for left misses