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I inflate my tires to the sidewall max of 44psi even for my typicall unladen truck. One of my tires (the right rear) has worn down in the center. I first discovered the uneven wear when I discovered that I had thrown the balance weight, picked up a nail, and the tire had been riding at 10psi for between 7-14 days. Between the *under* inflation and the imbalance (due to bounce scuffing) they more likely account for the center wear than an over-inflation.
On the inner edge wear on front tires it's possible that static negative camber is causing it, but if you've had your alignment checked this isn't likely the case. Some vehicles that induce negative camber during jounce may over-do it in the interest of dynamic stability causing higher loading of the inner shoulder on the outer tire, and vehicles with high kingpin inclination induce negative camber on the outside tire during steering. An under-Ackermann steering setup would drag/scrub the inner shoulder of the inside tire in a turn as well, especially during higher-g corners where body roll compensates out the inside tire's tendency toward positive camber and dynamic load reduction on the inside front corner reduces the transmittable lateral force for a given slip angle.
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