Dave, I watched your recreatios, all of them the 9 ball contacted the 6. The Filler shot the 6 ball is not moved by the 9 but a solid hit from the cb.
So working the tangents backwards from the 6 ball then a 2 ball strike first doesn't add up. Also at 6:50:xxx on the video you can see the cb path would be on the tangent from the 2 ball original position. At this point on the video the 6 hasn't moved while both the 2 and 9 have moved.
A thin cut on the 9 first recreates this with the solid by hit on the 6 by the cb and the cb following the path of the 2.
In summary, when you hit the 9 first the 2,6,9 had similar movements and the cb wasn't very close. With the 2 ball hit first the movements were similar but the cb wasn't close. All had the 9 striking the 6 ball before contact with the cb. Recreate the shot with the 9 not striking the 6 which is how the Filler shot went.