1. Only important if the cupping you have noticed is an off plane , horizontal wrist motion. If on the other hand it is the natural result of an on plane left wrist cock then dont change it. This is all grip type dependent. Do Yodas hammer drill and look, look , look at your left wrist. Mine cups a little as the left wrist cocks, so do most peoples I believe.
2.EA is a separate issue which may or may not help if you are really making an off plane left wrist motion. The cupping issue relates to the plane of the left wrist cock and the Left arm flying wedge.
3. Use the search tool for a variety of EA drills. The left arm is above the plane and therefor not inline with the shaft. EA is a pulling on the left arm and therefor a pulling in a direction below the shaft plane. The right forearm is on plane not the left arm. The left arm is above the plane but points below the plane.
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