Okay, I am no where near stock on my suspension. I am running the SPL catalog, bushing and and arms. I also have a Wavetrak rear diff. My spring rates 13K front and 11K rear. I am running at the full height of the coil over which make it about an inch lower than stock. I have removed all the stuff out of the trunk and the latest change included detaching the rear sway bar. I have no issues at all with squirm at all even when braking from 130 down to about 40mph.
I assume you have SS brake lines and good fluid as well? I am sure stiffening up your suspension will help. As mentioned above tires and proper inflation will make a difference.
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