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Well that goes with common sense too I guess. In a Hiway vehicle yeah, 5 or 10 psi below the maximum is usually more than enough. But then again, if you load it up for a trip across the country you should definitely raise the air up a bit. In general air it up for the usage you're driving most of the time and the tire wear should be good. I used to drive quite a few miles so I kept an eye on the wear. With my PU and trailer when loaded I did find that it handled much better at the max rated psi. Off road smaller UTV and the like usually the tires have a much stiffer sidewall anyway and it's not like you'll be doing 70+ MPH with it for hours on end.

You've answered your own question. The pressure is way too high. It's only running on that portion of the tire and the fronts wear faster than the rears because they take a beating from steering, especially on hard pavement. You must also have a very hard ride. Get the pressure down to the recommended level.