Before I had the 6 degree rear beam it had some slight play in the bearings of the rear arms, but not that much. And I don't know how the wheel alignment was at the time. But on the track it understeered very badly in the slow corners. Probably also in the faster corners, but I didn't enter them on the limit. With the 6 degree rear beam the understeer is gone. When I now turn into the corner the front just grips perfectly! It is on Koni's and fastroad Ahmed springs and I changed the 18 mm rear arb for a 20 mm arb and now the handling is very neutral. I did have a 21 rear arb with rose joints fitted, but it gave the car a bit snap oversteer which I didn't like, so I then changed to the 20 mm one.
In the video (~6.35) you can see the rear starts to slide mid corner, but it was very easily correctable. For that reason I just let it slide a bit before correcting it.
But with the 21 mm arb I nearly spun, it fishtailed 3 times before getting it back.
Unfortunately I don't have that on video.