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Basically, any time you change shocks or springs, it messed up the car's alginment. Toe is whether the tire is pointed straight, in, or out. To make a long story short, when you mess with the suspension, it knocks the alginment (toe is part of that) completely out of whack...you will shread your ties within weeks or months. I am supirsed the shop didn't tell you to get an alginment. That's most likely what the back tire is more messed that the front. The reason the front has a lot of inner wear is you have too much negative camber(the back will too, but it sounds as if the rear toe is worse than the front toe, a bad toe setting will shread tires quicker than bad cmaber, though both will shorten tire life). This is a natural product of lowering the car. Up to a certain point of lowering, you can get away without a camber kit. After that point though, you will experince accelerated inner tire wear, and a camber kit is needed to correct the problem. 2" or over requires a camber kit. 1.75" can vary from car to car, though most I have seen benifited from a camber kit. Something lowe in drop, like the 1.25" Eibach Pro-Kit mostly won't require a camber kit. I am sorry to say, but the shop guy was correct, you should always get new shocks when you get new springs. The spring ratio of the new springs and the dampening of the shock differ, basically to kep it short, it'll blow the stock shocks due to the stiffer spring rate, shorter travel, etc. Also, you need a camber kit to properly eliminate the inner tire wear. Also, you need to get the car algined ASAP. Remember, every time you add or change something on the suspension (shocks, springs, camber kit), you need to have the car re-algined.
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