I heard back from OSH Park about these boards. They said that it looks like the fab house made a mistake on my PCBs and they are refunding my order (for bityExpress-B boards). They also confirmed that my via size was valid and it should have worked. That's great news and gives me more confidence in OSH Park as a good place to get low cost four layer PCBs.
I decided against re-ordering rev B. Even though my PCB met specs, I'm going to look at some risk mitigation ideas and move on to rev C.
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