If there is anyone still playing in current times I had found a way to further increase difficulty on yourself and it has become the only way I prefer to play the game.
Go into your settings and change your HUD to "Always off". You think this wouldn't do much but you have to be fully aware of everything about the game, you can't see your health, your posture gauge, nor the enemies. You don't see the finishing blow indicator. Hell, you can't even see grapple hook indicators. It May take some getting used to at first but it is the best way to play the game in my opinion.
I had just recently started playing again so thought I would share.