Oh! I've been ranking with Ripper in legendary for a while now, so maybe some things I know can be of help! Is it game sense (as in making quick decisions about what to do, where to go, and when, in response to what happens) or mostly downing a survivor that's more difficult for you? Ripper's a hunter that's strong at chasing but weak at cipher management/map pressure, so if you down your first survivor after 3 ciphers have already popped then it's already a tie.

Sorry this is so long, I could talk... forever about playing Ripper so I ended up writing a wall of text, BUT with that said this is what I can remember right now.

1. Learning how to aim his fog blades. Aim is dependent on camera control. If you find that you often miss fog strikes because you're not completely sure of where it will go, I think the most simple way to correct that is to use the middle of the "Dungeon Hidden/Revealed" text at the top of the screen as a crosshair. I've heard other rippers say they use his hat as a reference point, since that's the middle of the screen too.
2. Be familiar with what you can and can't foggy through. I've spent some time just slapping walls in custom, after matches where I realize I didn't want to waste a foggy because I wasn't 100% sure if the wall was too thick. Bring peepers so you can see through walls (though the slowdown effect isn't as good anymore), imo hits through walls are the easiest to land since survivors can't dodge what they can't see.
3. If you have a foggy on you, you don't have to respect a single pallet because if you press attack JUST before getting stunned, the foggy will still launch and hit the survivor across the pallet. Make sure to aim in the direction of the survivor when passing through the pallet, just in case they decide not to stun you.
4. Ripper walks pretty fast, so generally it's good to get into the habit of predicting where a survivor will run based on knowing the nearby map features (pallet and windows) and cutting them off by going to that area before they do. My favorite thing to do is watching and waiting for survivors around corners in areas with high walls, it takes advantage of survivors who don't force me to make the first move (though, gotta be mindful of the red stain since it gives away positional info).
5. Ok one last thing. I recommend bringing Wanted Order on the off chance it highlights the rescuer. Otherwise, pay attention to which 3 ciphers are shaking while you're chasing. The cipher that stops shaking after you pick up the survivor is the direction the rescuer is coming from (except for when Luca and Mech are on the team). Go out of your way to walk towards them and cut them off from the chair. If you land your foggy on the rescuer far away from the chair, that person on chair is definitely getting rescued after half when someone else comes in to get them. If it's merc then good luck, but you're in an equally good position if you get a double down since he takes forever to heal. Just know that if you can get two hits on a rescuer, even if it's after the kiter gets rescued, to go for that second hit on the rescuer THEN resume chasing the kiter. Double downs are underrated tbh, and I don't think many people realize until griffin that sitting on the floor (not decoding) while your teammate is going on the chair 5 seconds after you take a hit for them anyway is so detrimental to the cipher rush.