overheating......

[talonite]

ok so i have eliminated almost all of my options on how to solve this coolant bursting out of the over flow container problem. on the dsm link it will read my coolant temp is at 130 but in reality its at 178-190 or operating temp. i have switched out the coolant temp sensor twice and checked the resistance on it and it was all in spec. i have also changed the headgasket water pump and all those belts, and well as the radiator cap and thermostat twice(first on was cooler) but i went back to stock. Im starting to wonder if maybe its a tuning issue? I dunno any and all suggestions are appreciated.