Originally Posted by
BCS_ZHP
From your video, I would think FCABs. You say you were shaking it aggressively at the end. Think about it, if you're 200 lbs you might have gotten 1/4 to 1/3 of your weight into that shaking, so 50-65 lbs of force. You car weighs about 3200 lbs, say each corner is 800 lbs, every bump & imperfection in the road is subjecting that FCAB to 12-15 times the force you were shaking into it. After new FCABs, you will see no movement of the LCA inside that FCAB.
And if you want your front suspension real tight, do the same thing and look at your tie rods. Our cars also get some play in the tierods such that they can be wandering and cause tire scrub. But if your issue is inner tire wear, then you might be running too much negative camber.