Not sure it is applicable for your unit but there is a PID calibration I did on my machine (makergear M2 Marlin ???) Set temp to 150C let stabilize, send 303 and wait till it is done and spits out the final number then send M301 and what it tells you at the end, then a M500..
Here is an example of config setting for one of my hot ends
Do not use this numbers as they are specific to the hot end it was run on
M301 P18.64 I1.24 D71.83 then 500

I switch hot ends to switch nozzles as it is faster.. Each hot end is slightly different so I have those setting in a file and just set them as part of the swap process
Good luck