It hasn't been uncommon for the games as a service games like CoD, OW, Fortnite, AL to feel a little different day to day for various reasons. Sometimes its netcode, sometimes it's a memory issue with your console that just needs a restart to fix. Game mechanic changes like aim assist can change how things feel too. The look mechanic data doesn't fluctuate like this unless the developer makes a change.
On XIM's side, config settings can create unwanted behavior. If you're experiencing issues I recommend starting by creating a new config with default settings to rule out config issues. I can also look at a tracelog of your XIM in the support section if you're wanting to know if your XIM is performing correctly.
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Titanfall 2's look mechanic changed on PS4 but yes, it does need the fix that other games received. The deadzone matches the new APEX Legends deadzone so I wouldn't be surprised if the AL ST feels better with TF2 than it's current support. I'm starting the retrain now.