Hi guys, thanks for the comments, and the info, it is very helpful in diagnosing the issues.
When you have the wheel mounted, and you put some side pressure on the rim, does it feel loose? If so, the hub end caps may be loose, which can be fixed using a hex key in the axel hole.
This could be an issue with spoke tension.
If that doesn’t work, I’d suggest you take the wheel into your local bike shop and have them measure spoke tension and increase spoke tension by 10kgf. We’ll happily reimburse you 110% of the cost of this.
Let me know if this helps. No matter what, we’ll support you and find a solution that let’s you enjoy your wheels fully.
FYI @CWayman the internal width of the rim is 18mm