Then make the change. Otherwise, you may be stuck with no defenders and one very upset goalie. Line changes should be done once every 30 seconds or so to keep fresh. Never let your players dip below yellow. If this happens, they will not be able to keep up with the opposition, and giving up goals becomes very likely.
Players are less aggressive in the offensive zone, defenders tend to hang back.
Wings less likely to crash the net. This is the default setting. It works well for almost every game situation, unless trailing or leading considerably. A moderate amount of offensive pressure. Aggressive Use this set-up when trailing late in the third to pump up your offensive pressure.