First time transiting via ADD and I have a few short questions. I will have a 4 hours or so layover next week, arriving around 06.00

* I have access to almost all ethiopian airlines lounges but also have access to Priority pass. As I understand it the cloud nine lounge could be quite busy and the Plaza Premium longe locked quite nice. Is it worth spending time there?
* I'm also planning to perhaps visit the Cloud Nine lounge, but just to take a shower, are they any good? I expect I have to wait?
* I'm a Star Alliance Gold, and will be departing at T2 and A gates, should I use the Gold security to speed up things? If doing so how much time should I add?

Thanks