One other thing:
Since the monitor is a TV it suffers from HDMI overscan... I can't change this in the settings of the monitor

If i unplug my lcd monitor (the one that is connected via native hdmi) i can use fit to screen and thus solve this issue. The problem however is, that once I plug it in again everything is back to normal

I'd need a resolution of 1220x670 due to overscan. Is it possible to unlock fit to tv when I have the other monitor connected? What does this lcd have to do with the displaylink adapter?