If I am seeing that correctly, there are chunks taken out of the shoulder and a bit of rollover onto the sidewall? To me, that looks like a tire that has suffered hard cornering at too little inflation. Alignment might not be an issue. My crappy street tires I first autox'ed on used to look juuust like that if I didn't keep enough air in them.
A good way to tell is to take a white marker/liquid paper/chalk and make a couple lines on the outside edge of the tire. Go for an agressive spin. If the marks are worn too far onto the shoulder/sidewall, add more air and repeat until you feel more comfortable.
BTW: what kind of tires are you running? It may just be time to get something with a stiffer sidewall...
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