As someone who beat 20/4, I'd say you do NOT want to ignore foxy's attention needs as she is going to eat your power by killing the door, I play by the 6/3 rule. (6 seconds outside cams/3 seconds watching foxy) That way, she will really only run 3 times per run, which in turn will not eat away your energy. When it's 5 am, you should ignore foxy and put the cam on cam6 so freddy can't attack you, then hope for the best after you lose power.