Sorry to hear about your PS3 troubles Cheapy, but I'm glad that someone at the AVSForums was able to help you with your first problem ... but here's a suggestion if I may ... since the HDMI "trick" resets both audio and video inputs, have you tried exiting to the dashboard from either Genji or Resistance, then going into the audio options and switching the input from there, then reloading the game?
I don't know if you've tried this, but I figured it was worth a shot.