Still stuck at bootloop.
I booted to download, flashed ap_mk2_normal.tar.md5 with auto reboot. Then I booted to safestrap, wiped all except external SD, flashed GE-SAFESTRAP-XXUFNBH-26.zip, UPDATE-SuperSU-v1.93.zip, and AT&TNB1KernelModules.zip in that order. Reboot back to download, flashed AP, BL, and CP from Deadly Venom tool with auto-reboot. Stuck again at Samsung logo.
Not sure if it's worth mentioning but I flashed the non-SafeStrap version of Goldeneye before now, realized my mistake, and started using the correct rom. Could it have flashed something that I need to revert?
Edit: I am current flashing the MK2 downgrade to try to boot so I can try to pick back up from a booting rom.
Edit2: Success! That must have been the problem.