This.
If you don't break them in properly they'll just glaze over and become noisy/shitty again.
Also, I'm not familiar with the calipers on that truck, but if it has slider pins you should lube them also. I see you lubed the bolts, but if they aren't the type that also function as the slider that won't do the trick. Sliders typically have little rubber boots on them to hold in the grease, but that can ooze out over time and can cause the caliper not to slide as it should. You'll want to use a good hi-temp grease for them, not anti-seize.
Edit: This assumes that your squealing problem is that it squeals all the time when you're driving, like it's lightly dragging a pad. If its just squealing when you apply the brakes, it likely has nothing to do with the sliders.