I've found as survivor, setting it to 473.5 is just a bit faster than normal, and doesnt look suspicious as long as you dont keep it on. Use it when youre running from the killer and break line of sight, to get a small boost to allow yourself to get away, or while looping. Make sure to hold shift occasionally to leave scratch marks, as running without leaving any scratch marks does look quite odd to the killer (holding shift will return you temporarily to normal running speed and leave scratch marks).