[Q] New ROMs stuck at splash screen using SafeStrap topic

I have an unlocked AT&T Samsung Galaxy S4 and have been trying to use SafeStrap to flash new ROMs. Everything goes like normal, ROM looks to be successfully installed. But I have tried to flash three different ROMs that are compatible with SafeStrap and my device, and each of them get stuck in an endless splash screen (I waited more than 20 minutes.) I did not mess with the stock ROM slot, so that is still intact. This is really frustrating, has anyone else encountered this problem? I've already tried factory resets and data wipes on the ROM slot, and also have deleted and re-partitioned the slot twice. As suggested online, I was flashing three zip at once: the ROM, kernel, and superuser.

HAAAALP