So LGNPST got everything working. But when you installed Stocktimus O you got stuck on the Sprint boot screen?
Did you give it about 4min to make sure it booted up?
It should work with both TWRP and CWM. I installed with both when I built them.
I know you've flashed before, but just in case, wipe /system, /data, /dalvic, and /cache.
If you don't want to do this next part, I'll see if it's something on my end:
If it doesn't install with TWRP, could you wipe your SD and try it again? I know it'd be a pain, but at least it would let me know if I need to fix the updater scripts.
Make sure your phone boots up. Then in recovery wipe "internal data" or SD and reboot. Your phone should still boot as long as you don't wipe /system.
If for some reason it won't boot, you may need to ADB sideload a rom, or LGNPST again.
Just trying to cover everything.
TWRP didn't give me any different results. Same deal, just booted with the original Sprint screen, not your boot animation, nothing had changed...