Thanks for giving us an update...
Okay, good news for now...
While it looks like you have addressed the immediate problem, get back to us if you break spokes again in the same area. My thinking is that you may have rim with an extrusion defect - such that a "soft" or "relaxed" spot exists that results in a small group of spokes in that spot ending up slightly under tension compared to the rest of the spokes. Can also be caused by bad joints - but not in your case.
It's pretty common Star Circle made rims from China, and also common with Alex rims that come with bottom line entry level road bikes from the major brands. Typically folks have to apply some more tension in exchange for an artificial flat spot and some minor out-of-true - or change the rim.
Other than that, good luck.
=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