Yep. I got talked into the manifold swap (which has been done 1000 times on the forum). I think I just got a f’ed up manifold with an uneven surface where it mates with the lower IM. Either that or the fuel rail/injectors I got weren’t good, but they were tested and tested out okay. One of those two caused my P0171 code (lean bank 1).
Lessons learned.