Preform sagging away from fpga
https://files.ioc.exchange/media_attachments/files/111/706/687/971/001/979/original/9e2ff514d843e73e.jpg
No go same failure mode. Preform expanded and sagged away from the BGA causing center balls to not make contact.
This chip might end up becoming microscope food. I'll play with it more but it's been through a lot of oven cycles now.
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