I had two places say they aligned my car and I was good to go and I still burned through two sets of tires. Pretty much lasted a year each set just like you said. In all honesty, on a fox body if you lower it the stock adjustment is never enough. it may be within spec when on a rack, but once you get on a rutted/grooved road or starting going through the twisty's, the steering gets way out of whack.
My old foxbody would pull like a mother on some roads and drive fine on others so it really depends on where you are as to how the steering is being affected. I would absolutely suggest caster/cambler plates or at least camber plates. I had never even heard of camber plates only, but the last place I brought my fox body to get it aligned suggested them to properly align it and it solved the issue. It still pulled on rutted roads but I never burned up a set of tires again.
You may also want to look at bump steer kits. I know that when you lower a fox body the steering arms can get out of whack and are at an odd angle which can cause them to be easily influenced by the road. The bump steer kit gets them back to the stock angles and can dramatically improve the situation.
Torque: It's like crack for your right foot