I can officially say I consider this journey 100% successful now. This is my biggest PAA site:
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The funny thing is that the last update everyone is crying about didn't seem to affect PAA sites.
Our app is multithreaded now with full proxy support and I'm in the process of generating this stuff on around 150 domains with my partner this month. We invested in a bunch of strong/aged/high DR domains.
I will still update this thread with new findings and ideas whenever I get the time. Cheers!