Temperature fail installing on ender 3

[Suco1234]

I have installed the board correctly on ender 3, but when i print a code, the upper side falls into the fill. i have done the next tests:

-I have already adjusted the feets/mm on extruder.
-It seems to be a temperature problem, it looks like the nozzle is warmer than the LCD says, so I changed the thermistor with a new one and configured correctly on marlin. (the resistor value seems to be correct based on the thermistor table)
Thermistor is NTC 100k at 25, beta 3950, sensor 11 on marlin config.

• The problem appears when I print PLA at 200ºC and 20% fill. The upper side improves when i print at 190ºC.

The same Gcode with the original ender 3 board and stock firmware looked great, so i discard a problem with slicer.
The next test i am going to do is to heat water to 100ºC and check the thermistor resistor value.
what else can i do?