As long as everybody runs a heater pcb with the heat traces on the back side *and* the thermistor is on the back side *and* there is insulation below the board *and* the board is about 1.5 mm thick *and* there is an air gap between the board and glass *and* the glass is about 2 mm thick *and* the room is between 20 and 30C ....

Setting the bed temp to 80C will get you the same surface temp as everybody else gets. This all dates back to the original i3 design. It is common to about 90% of the printers out there. Unless you start looking at information from a MPSM or something else with an aluminum bed, your numbers will be the same as the other guy's numbers.