Check the following on the wheels:
1. Machine lacing as opposed to all-elbows-out-pulling or all-elbows-in-pulling.
2. Using a tension meter - check to ensure drive side tension is at least 110 kgf - or higher for low spoke count wheels.
3. Place one drop of light weight oil at each spoke crossing point. Give all parallel spoke pairs on both sides a good hard squeeze for two rotations.
...not much I can suggest without more details and having the wheel before me.
It does look as though you've eliminated the frame...
=8-)
__________________
5000+ wheels built since 1984...
Disclaimer:
1. I do not claim to be an expert in bicycle mechanics despite my experience.
2. I like anyone will comment in other areas.
3. I do not own the preexisting concepts of DISH and ERD.
4. I will provide information as I always have to others that I believe will help them protect themselves from unscrupulous mechanics.
5. My all time favorite book is:
Kahane, Howard. Logic and Contemporary Rhetoric: The Use of Reason in Everyday Life