Could the sound be going to both the speakers and the submix? Set the effect to +20 and see if speakers blow up.
Set audio to 100% send only to submix and it will be pure submix signal.
Or in this case, if it’s meant to be a master master limiter, we can add effects to the master submix(its always there by default), and it will pick up all sounds of game, then we can compress/limit etc there.