I'm going to speculate based on those pics that I was right. It appears that your k-member has been pushed over to the driver side a bit, possibly from an impact with a curb or something. I've seen it on my car after a sideswipe accident and it caused all sorts of alignment issues.
Notice how all the adjustment on the passenger side plate is outboard of the plate and all the adjustment on the driver side plate is inboard of the plate... screams out that your k-member is out of whack. Also explains why an ok alignment (only ok) is causing nasty tire wear.
Once that's done you'll need to rotate the tires front to back and get another alignment. Then smoke the crap out of the rear tires to get rid of the wavy wear.
If you have any trouble finding a place that does mustang tuning and suspension around Tulsa see if you can find an F-body tuner shop. They use the same basic k-member technology so squaring them is similar. Otherwise, you can try searching the corral.net forums for a good shop around there.
BTW... tire pressure being too high normally wears the middle of the tire, too low wears both edges but not as much on the middle. Neither should normally cause any sort of wavy wear. Cornering too hard will but usually on the outside edge of the tire and it's a very distinctive scalloping pattern.
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