More likely the inserts are too hard than tyres too wide, or you do a lot of wheel spinning, they have to have a round profile so they grip as the car rolls into the corner. Or you'd end up balancing on one corner of the tread........ and sliding off the track.
FWIW, the only tyres i've completely knackered in the middle without doing much damage to the outer edges were ones i destroyed on a carpark (tarmac). The tyres i've driven (rather than trashing) tend to wear out *fairly* uniformly. And get binned before they are bald anywhere!
Try a softer insert next time. Or a harder tyre, or both.
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