the front upper strut mounts make a metal popping noise when it's broke, i just had mine replaced, but it sure didn't make the whole car shake...
as for the shocks, perhaps the tme springs have hastened their end, as the added stiffness only makes the shocks work harder. but it should not be felt as a vibration, more like endless up and down i.e. a boat.
could it be that the pads are not set properly or something? it sounds really more like brake problem (i have 13" brembos that have a slight shaking prob at 40mph and only 40mph, repeated hard stops make it worse, but it still only resides at 40mph)
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