Upper control arm bushing extra part?

I watched your video and was alarmed at how much movement there was, when everything is correct the only movement should be limited to the torsional Flex in the rubber, so your assumption of the holes being made bigger with all the movement makes sense, I'm sure I've seen aftermarket stamped steel arms sold somewhere alot cheaper than the tubular arms, it might be worth looking into replacing the arms. Anyway looks like your on the right track to a solution.