[Mike O]

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So the question is this. Is the goal to get the hands clubshaft and the right shoulder to stay one this plane in the down stroke?
Could be if you want - but certainly only one option- doesn't need to - choice not a fundamental.

Then at impact should the clubshaft, hands, right forearm, and right shoulder be on this plane?
If that was your goal or choice - sure but not necessary.

So is this off plane because my hands are lower than the turned shoulder plane at impact? It's off the turned shoulder plane- Yes, but staying on one plane is not really that important- as long as any shifts still allow the sweetspot/clubhead feel to maintain it's relationship to the plane line.
And should the sweet spot travel up the turned shoulder plane on the back stroke? Could but not that important- it's a choice not a fundamental.

The Golfing Machine supports "my way" procedures but not "the way" theory.

Here's Mike O's feedback - You're going to see shifts- you're not going to get better by trying to stay on one plane- probably going to get worse. You want to maintain the clubshaft/sweetspot relationship to the plane line- understand the shifts but don't view them as inferior procedures. Not that you asked but the mechanical issues with your impact photo are - the right forearm is too high, inadequate hip slide/rotation (hips are "square"), the right foot is "flat". That's a result of other issues- loss of lag, or other issues- so I wouldn't work directly on the feel of the forearm location, nor the hip or footwork- they are affects of something else. However, when you find that something else- you'll see a different elbow, hip, foot "look" at impact. Anyway - food for thought. The first "issue" I would look at is your mat - get something where you can hit a more descending blow on a "fluffier" lie- otherwise you could be creating a swing that throws the clubhead in order to prevent you from hurting your wrists on the mat at impact.

Regardless of whether you are a plus 2 or a 15 handicap or somewhere in-between- that's what I see.