if it was worn out in the center I would suspect the tires were over inflated, when you say starting at 35 psi do you mean the target/hot pressures? otherwise it would be insane IMO
, even for a lighter car like ours...
But in the picture where you're holding the level it looks like it wears from the outer/right side which may be normal with the lack of more negative camber (or vice versa if it's the inner side) + more left turns + over-inflated tires..
It may well be a combination of those factors but hard to say which contributes more