Stick one of the spoke elbows and its head between the jaws of a caliper...measure outside of shank to face of mushroom...if 6.1mm to 6.3mm...those are good spokes. If much larger, i.e., closer to 7.0mm, those are el cheapos.
Might as well use the calipers to measure the flange thicknesses as well...
Washers won't do much good though if the spokes are 14g inside 2.8mm flange holes. Usually spoke head washers are roughly the size of the spoke heads themselves...they're head spacers - not hole fillers.
Out of ideas for you at this point beyond what I've already said...
=8-)
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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