Wow. You haven't had much luck with this issue. As far as the lifter noise going away, that indicates to me that there MAY be a pressure issue at start up, but the lifters eventually build up and the noise goes away. If you remove the oil pressure switch from the engine and install a mechanical gauge, it will tell you the exact pressure. Most parts stores will rent one to you and all you do is remove the electric sender and install the mechanical one.
Do that and let me know what the pressure is. Also, let me know what viscosity oil you are using, if this happens if you shut the engine and restart it shortly after, basically anything you can think of may be helpful.
Sunday, November 15th, 2015 AT 7:39 PM