Is this the blend door actuator you changed #5?
Look at the plenum chamber on top of the evaporator case. Take a close look at all of the actuators for movement and make sure that none of them are broken. The vacuum actuators will still move in and out but if they are broken off of the connectors, they won't open the doors. Bare with me I am just trying to figure this out with my schematics.
The plenum sits on top of the evaporator case right in the center of the dash behind the radio and ac control head. #6. I went back and looked through the blend door operation diagram and everything you are describing, including the actual pinpoint test, points to the temperature blend door actuator. If you want I could send the diagram then you can see how the air flow operates in this system. Let me know.
This is the air disribution schematic I was talking about. Numeber 8 being the temperature blend door. Yes check that door closely to see if it is binding. That would not allow your heat to come through.