I should note that in the old, previously working version of CWP I changed a few things. From what I remember, here's what I did:
Changed to port 2083,
Modified log rotations,
Changed PhpMyAdmin URL to 2083, and made it use SSL,
Added some extra tools to the "Developer Tools" or whatever it was called; appears to be scrapped in the new CWP version
Modified apache a little bit, was always a pain because everytime CWP updated I'd have to re-upload my changes,
Did something (forgot) to make RoundCube work properly.
As far as I know that's it. Not sure if this is why I'm having so many issues or not. If someone could confirm with me that the new version is stable on fresh installs, then I will gladly spend the dozens of hours downloading the terrabytes of data on my server, wiping it clean, and fresh installing CentOS 7/CWP. I don't want to do all that work to no avail though. I like how the new CWP LOOKS, but it doesnt FUNCTION properly AT ALL for me. If it's not stable enough for production (someone confirm please), I will just reinstall CentOS 7 and throw the old version of CWP on there. Me, and my entire staff team loved it and had no complaints.