I’m a novice at best with this stuff, but that video looks to me like you’re controlling the extension pretty well. It looks like the axle rotated some by watching the wheelie bars, but it’s not extending/separating much at all. I do see a little bounce in the car just after the hit (about 3 tire rotations out), but it again doesn’t appear to be reflected in the axle position relative to the car. Smart guys are here to reel me in if needed, but it looks to me like axle rotation may be your issue, not axle extension. With this in mind, I might suggest to look at preload on the bars more than shock setting (??). How much preload is in them now, and what hole are they in?