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R7 had a very similar failure, likely for the same reason.

So process optimization takeaways so far:

1) Paste release is indeed a problem on smaller apertures. I knew this, which is why I'm investigating electropolishing.

2) I need to be more careful when handling high density boards post-paste to not bump into the fresh paste deposits and smear them.

3) When reworking bad paste prints, I should put more effort into ensuring the paste/flux volume of the reworked deposit closely resembles the intended print.