Maybe i missed it; what brand were your first two high output alternators?So I thought I'd update this.
I ended up finally fixing the issue after buying a mechman alternator. so there you go my fellow f150 5.4 owners.
Only the mechman regulator seems to be able to keep up with the the truck.
For documentation sake I fixed it well using a 1000cca agm battery, 1/0 cable all the way through the electrical system, and a belt that is 1/2 inch smaller then the original (2008 ford f150 lariat fx4)