Yeah that's what I was thinking too.On the reverse video, it kind of looks like the sounds match up to your transmission movement. I'm not sure if the level of movement is normal, but it seemed like the transmission was moving around a lot.
Yeah I can see the endlink making contact but unfortunately the Ohlins did not include nor do they supply any endlinks themselves.You can see the contact in the second video. The swaybar/endlink are hitting the steering tie rod. I had this issue when I was running FA 500 coilovers and used the stock endlinks instead of the much shorter ones supplied with the kit (Like 4-5" shorter than even the WLs). Looks like your coilovers have a similar lower mounting point for the top of the endlink, and should have come with a set of the correct length. There should be like a 1-2" gap between the swaybar and the steering tie rod.
You can prove this easily by removing both ELs and driving, the pop will go away.
It was recommended on the FB group to remove the washers entirely as it makes it wide enough to make contact and just torque them down as hard as you can. I may try that after disconnecting the FSB to isolate the noise.