i check to make sure you have the right bolts and the right tabs, i know a lot of the smaller bushings like that use a 5/8ths bolt where as the larger bushings use 9/16ths. the bolt should fit snuggly in the tab and the inner sleeve of the bushing.
if it was moving laterally i would say it your triangulated bars werent triangulated enough but since its rocking forwards and backwards i would check your tacks and make sure nothing broke. then i would check rock the axle back and forth and try and look for where your tabs are flexing.
right on man, yeah i went out and moved it a bit and i can see my tabs kinda flexing so im gonna weld them up fullly and hopefully that solves my problem.
my FBI 4 link kit came with all 3/4 " bolts and my tabs and heim joints were 5/8" so I would have had play there, so I had to go and buy all the hardware over again, I think somebody at FBI is asleep at the wheel.