Thanks for that link, I do have a high speed SLR so I will get much better videos posted this week.
Also, thank you for taking the time to look at my swing. Very interesting to see the comparison with Adam Scott, and yes indeed it looks like my downswing is very steep especially in comparison with his!
I guess when I posted I was mainly thinking about my back-swing though. I think you will notice that in the first video, my takeaway is very shallow. This is when I then cast the club out in my downswing and come in very steep. So, I was curious if my back-swing was the core of my issue.
Here are screenshots of two positions, takeaway and top, with each swing. The heel-hit swing at takeaway is perhaps too far inside and possibly even fanned? At the top it is below my shoulder. The center hit swing the takeaway is forced outside, and at top it is in line with my shoulder. Granted, as you have pointed out, the downswing introduces some other issues.
Additionally, I think this is the what I was hoping to achieve actually. By steep plane, I was referring to my backswing and not my downswing. I should have probably made that clearer in my original post.
My steeper backswing seems to promote a shallower inside-out downswing (good) as you pointed out. My shallow backswing seems to promote steeper and outside-in downswing (bad).