Has it occured to you that you might be learning and adapting? That's far more likely than any conspiracy theory about "hidden changes". There's zero proof of hidden changes being implemented. And as
@AlexWilmot says, anyone with education should understand that controversial statements need to be proven, not disproven. Conspiracy theories are controversial.
I haven't felt any changes, and I've been fine from the start. But that's just another anecdote.
Anyway, I'm glad that you're doing better and enjoying the game more!