Default [Q] Help with S-off

Trying to get S-OFF (HBoot 1.57) but I'm running GPE 4.4.4_KTU84P.H1. I've tried installing different ROMs but phone gets stuck on boot screen. Firewater tells me I need an unsecure kernel (tried teaMSeven & ElementalX, same thing), Rumrunner gets to (10) pouring, then I get the "pray, run rumrunner again" message.

I think maybe I should have got s-off before moving to 4.4.4. Do I return to stock then try with a different rom (CM, perhaps), or is there something else I can try first?