Thanks for the firmware King5six1!
I'm happy to report that the upgrade went super smoothly. I just threw the unzipped folder on a FAT32 formatted flash drive, plugged it in, went to update from USB, and it found the file. It performed the optimization. No more POPS to report!
I have a PN59D550. YES!!!
Display - JVC DLA-RS4810 Projector, 106" Da-lite screen
Equipment - Integra DTR-6.8 AVR, Mac Mini HTPC (Win10, Kodi), Xbox One, Apple TV (3rd gen)
Speakers - Tekton Pendragon Towers, Pendragon Center, Pioneer BS-22s, dual Outlaw Audio Ultra-X12 Subs