When HK uses the phrase "flat left wrist", in most cases he is referring to a "geometrically flat left wrist" which is what creates the left arm flying wedge. There are other ways to "proof" the left arm flying wedge. Another way is to use the dowel. If your entire left arm and clubshaft lie flat against the dowel (inside of arm and right side of shaft), then your left wrist is geometrically flat. This is a more accurate method than the bent right wrist method.
I'm not a teacher but I don't think that when you hit a ball left of target it is caused by the over-flattening or arching of the left wrist. You must be pulling the shots. If you arched your left wrist (geometrically or visually), then you will throw the swingle out of alignment with the handle (you twisted (bent) the wedges). This causes the late, hooded and open clubface which would send the ball out lower and then fade off right. You must make sure that you DO NOT cock or un-cock the right wrist (must see Yoda Video).
The surprising truth about swinging (and only for non-manipulative swingers) is that your left hand can be turned 10 degrees weak or strong and your clubface will still align and provide straight-away ball flight if your wedges remain solid (Flat left wrist and bent right wrist). The left hand for swingers doesn’t align the clubface, but the flat left wrist does. Centrifugal force aligns the face (centrifugal force pulls the left arm and clubshaft in-line) for swingers and Horizontal Hinging is the preferred face rotation throughout impact.
HK wants swingers to use Strong Single Action Grip (turned left hand) because it puts the left thumb directly behind the club shaft aiming down the angle of approach and in line with the #3 pressure point. HK designed this grip to do that. He didn’t say "left or Right" this degree or that, he said exactly where to place and turn your hand if you want to use this grip. He is also saying that you can use weak single action if you want. It just won't have the strong impact deceleration prevention that the strong single action grip has.
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