I like XDA Developers for better ROMS. There's also the option to use this to get out of your contract (hey, you broke it ATT!) and get another phone.
Bob
My Galaxy S4 Active used to be fantastic until recently...
Went on vacation over 4th July for a week.
AT&T had the KitKat 4.4.2 update and forced it on my phone after ignoring it multiple times.
It used to run 4.3 rooted perfectly fine until the update. Battery lasted three days with average use and ram never went over 500MB. Root is now gone, and more unwanted bloatware has been forced upon me and my phone. This update has broken my phone, almost literally.
-screen gets VERY hot
-battery discharges from full to 20% in 2hr even when idle
-RAM magically fills up to 1.5GB, but the only running apps only add up to around 500-700MB
-CPU-Z shows the CPU randomly spikes to 100% for no reason
-battery is physically good, did the spin test, no bulging
-charger is A-okay, plugged it into P3 meter when charging
Searched online for hours. Others appear to have similar issues after the forced update. Obtaining root and 4.3 seems far and wide.
Is there anything to do to fix this temporarily?
Am I stuck with this garbage 4.4.2 forever?
How can I get back 4.3 with root again?
Open and willing to try all suggestions.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic