you put spacers underneath the motor mounts so that it raises the engine and transmission back up so that the axle geometry is correct. that is the reason why it shakes when you lower the car. your other choice is to shorten the front dogbones about 3/4".

the spacers are the "right" way to fix it, but the dogbones work. ive got shortened dogbones on mine and it took away the majority of it to where i dont mind driving the car. before i shortened them it shook horribly.