The FLCA (Front Lower Control Arm) bushings can cause tramlining. I had a noticeable decrease when I went to a set of SPL front bushings on the FLCA's. I have yet to do the Impact Bushings however.
If the Z will be a second car soon, I HIGHLY recommend going with everything SPL. My Z is my daily and I will eventually have just about everything in the SPL catalog on my Z.
Spacers don't make the problem worse really from what I have noticed on my car. The stock bushings causing dynamic alignment changes will do the most to cause movement under braking.
Multiple alignments aren't a big deal if you have a trustworthy Firestone shop around you for a lifetime alignment.
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