Too low and left with knee buckle?

Here’s a photo of what I mean low and left exit

That low left exit can come from either:
Too much forward flexion (not you)
Too much lead arm internal rotation (possibly - worth exploring)
Too much trail wrist flexion instead of pronation (probably part of your issue)
Too little ulnar deviation (probably part of your issue - see impact image from DTL)

When the shoulders/arms are too active, the buckle is a likely compensation. I'd work on that follow through position and connected the presetting spine rotation to a good follow-through feel.

As far as the submissions, I'm working on some projects right now that take too much time. But I wouldn't rule it out in the future.

Here's an image taken from a program I'm working on for helping you guys analyze your own swing. And I added a version of your picture with some lines. Notice in my image, you can see some of my left arm and the right forearm is more in line with the shaft. That's a sign of unhinging and it tends to result in less pulls as well as less diggy ground contact.

Does that help?

Tyler