First, it looks great! As for the wobble, if it is happening even when not standing, I have to think it might be the arm.
I’m waiting on my Uplift V2 Commercial to arrive (it shipped last Friday but I might not get it until next week. Sigh.) and I’ll be using with with an Ergatron LX arm - but I won’t be able to offer feedback until I get it in.
Based on my past experiences with relatively heavy monitors and arms, my instinct says it might be the arm and that adding either a bigger clamp or having something like this
https://vivo-us.com/products/stand-ac01r, but I’ll defer to others in this thread.