[O.B.Left]

Grant you're under the Plane at Top .........which will often tend to bounce you back over the Plane in Startdown. It may be Right Elbow position. Research what Lynn calls the "goal posts". Probably on video more than in a Yoda post Id imagine. I think it'll help you a lot.

And maybe research "geometrically flat" left wrist at Top as opposed to literally flat, which is often achieved via an off plane left hand wrist cock. Something Tiger is struggling with so you're in good company. Ideally the club lies on the inclined Plane at Top........ but the Left ARm doesnt, cant, its above the Inclined Plane, given any #3 angle in the grip. "Flat" at top is not "literally" flat given a 10-2-B grip type.