are coilovers that are lowered all the way more prone to blowing?

 

the coilovers will probably be fine, but ur shocks will be blown very fast. shaft travel on the shock is crucial. when u "dump" ur car all the way, u have very little to no shaft travel and this will cause the seals within the shock to break. raise ur car up, get a shortened shaft shock like Koni's and be good to go.

 

my seals were broken last time because the mechanic didnt install the bump stop properly. What is the best way to adjust the coilover when its installed and to make sure that the sides are even with each other. is it okay if they are not exactly perfect with each other>?

 

There's a few ways, and none of them are perfect. You can count the number of times you spin the perch, you can try measuring how much you move the perch, or you could just take a flat-out guess (the last one being the most inaccurate approach lol). Really, you're going to be going from wheel to wheel several times measuring (I'd suggest from the ground to the highest point of the fender arch). I'd suggest trying to get it even from side to side; front to back won't matter as much, since the rear fenders are slightly lower than the fronts anyway. If you don't have it at least close from side to side, you'll be able to tell when looking at the car from the front.