Most tires in AZ will crack rather quickly for obvious reasons. It does not necessarily indicate a shot tire, depending upon where the cracking is (above tread sipes, no. Halfway down the sidewall, yes). What are the date codes on the tires, what is the tread depth and what psi are you running all-around? Is it worse in the morning while the car is cold? Is there any associated noise with this? Does it get better after the car warms up?
It may seem odd but it could also be motor mounts or any of the rubber mounting components down the line. Also can't rule out a failing bearing on the drive belt system.
I am very sensitive to these things (and super picky) if you would like me to take a look at it for you and see if I can help pinpoint it. I don't mind.
Even better, if you are willing, is swap wheels and tires. That will eliminate one large variable.
In addition to possible bad tires (although 1 is possible, 2 unlikely), recheck the alignment settings. Outside shoulder wear could be from bad thrust arm bushings (supposedly new) or not installed properly or bad alignment (too much toe IN). If should wear is uneven, look at front shocks.
If you are putting new fronts tires on, perhaps an alignment at another well known shop would be wise to 1. check the work of the first shop and 2. eliminate front end alignment as a variable.
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