Ahmet-
I was under my car this weekend looking at my bushings, and i think i have an idea what might be your problem. If your front bushings slide in the arms, the problem is likely in the rear bushing. The rear bushing is supposed to take all the thrust load. This is evidenced by the large washer welded to the a-arm just on the front side of the part that slides into the rear bushing. This rides on the front face of the rear bushing. If this thrust area is not taking the thrust load, the front bushing will be forced to do something it wasn't designed to do. Specifically, taking a thrust load, which causes the bushing to slide. Maybe there is some unknown damage to the suspension mounts of your car. If the rear bushing mounting portion of the frame has moved toward the back of the car it can no longer provide the necessary thrust support for the arm.
Mike
p.s. you didn't remove those welded washers while trying to reduce bushing friction, did you?
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