What makes you conclude that the steering shock is good? Usually they compensate for any slight wear in the front end and dampen any harmonic that wants to occur.

I've got some vibration on the SD on high speed right handers. A well respected alignment shop didn't see anything of consequence and most likely attributed it to the steering shock. I'm going to do some replacement of LCA bushings, subframe bushings, and the two guide rod bushings just to tighten up the front end a bit. I'll also do the steering shock.

These front ends are definitely sensitive to any worn components. They respond with vibration and pulling..........and then you start the chase.