Problems in every mode making the game difficult to play

The game modes have been steadily getting worse for me over the months, already leading me to only play Rush (where everyone seems to have some degree of weird problems with bizarre animations and inputs) and Squad Battles.

Now, in the past week, they've both become difficult to play and I am at a loss of what else to try. I can only describe it as though it feels like my game is out of sync with my teammates and AI opponents and I am plagued by bizarre animations, inputs, and responses.

I have tried a number of things to try and solve the problem from using queue prioritising management settings on the router for the console, a static DNS, activating the QoS settings on the Xbox... In fact, the more I do to improve my connection, the worse my problems seem to be. Yet the improvements are causing online play on other multiplayer games to improve, so it seems like an FC specific issue.

I have run out of ideas.

For just a selection of the issues:

• Players don't decelerate normally, instead they slide way past the point they should.
• Weird collision mechanics which mean in any given game my players are falling over multiple times. Sometimes over other players, sometimes over what seems like thin air.
• Players almost always take extra touches, or heavy touches on receipt of the ball. It's not possible to first time pass effectively or first time shoot. 
• Passes regularly go in different directions to where I'm pointing (and this is almost hilariously obvious with precision passing throughball guidance arrows on).
• The AI is clearly reacting to events in the game before I'm seeing them. For example, they stop running for a ball a good second or two before it's gone out of play, animations associated with a save or a goal kick in before the event has actually happened.
• There is heavy delay in the camera panning into position for kick-offs, corners, even longball goalkeeper kicks, leaving me unable to actually see the gameplay for a second or so because I'm not there on my screen.
• Players are heavy to turn or move, often taking longer than they used to to move into a sprint and occasionally slow down as they approach a ball to a ridiculously slow pace. 
• There are weird bursts of speeding up and slowing down, where you can see the animation of the player's legs are too fast. Alternatively, sometimes their legs aren't animated at all and they just skate around without moving their legs.
• Players are pulled or pushed out of position as if some kind of AI assistance is being applied. Sometimes this is really apparent where the player visibly is yanked at speed a good couple of in-game metres from where they were a split second ago, while other times it is more subtle and you feel like you're fighting against the game to keep your player in position.

There's more, a ridiculous amount more to be honest, but I am just beyond frustrated that I cannot play even Squad Battles at this point without experiencing these ridiculous gameplay issues.

Has anyone else experienced this and solved this for themselves? Is there something I've missed or am I completely out of luck?

My Xbox runs on a wired connection, with an average of over 500 Mbps up and down. The Connection Quality Reports gives me a score of 98/100 (solely dragged down by Rush games, it seems, which are the ones with a few marked Good as opposed to Great. Ironically, it would probably score me 99/100 if I didn't play Rush, yet Rivals, Champs or Friendlies feel worse than Rush right now).