Ok, i’m gonna update the situation.
I tried the mega drive with a new power supply and the problem dissapeared!
So it seems my OSSC wasn’t faulty after all?
So now that the big thing is out of the question i’d like to ask.
If i get REALLY close to the screen, i can see some white dots randomly flashing on the screen (specially on a black background), almost impossible to see at normal viewing distance, is this expected / normal behaviour? I tried to capture it in a video but it’s impossible.