Well it's been a little over a week now. The truck hasn't gotten hot. But the temp gauge is still moving above normal. So I've gone through and double checked for vacuum leaks, checked all clamps and connections, and repositioned the upper radiator hose. I had air in the system still, and I think I still do have a small bubble in there. Just to eliminate possibilities, I replaced the radiator cap with a 16 LB. Non-levered style cap and added half a bottle of "Water-Wetter" coolant additive to the system. Then I drove the 30 miles home and really laid into the truck to try and get it to burp on it's own. Well the temp gauge didnt flinch a hair.
I think I've got about 99% of the air out. I'll keep at it and report back if anything significant changes.