Every game is more immersive without any health bars and meters covering your screen. Alot of games have these bars hidden and only show them when
its needed or when thier values change. So i think this should be the case in SCP:U aswell.
I would make the health bar appear only when the player takes damage or when the player has under 25% health. The sprint bar should only be visible when the player is using up stamina or when the stamina is regenerating. Also i think the player should be always blinking even when 173 is not around, however the blink meter would only appear when 173 is around or when the player choses to blink manually.