Things are binding.
When you rebuild the front end, all the attachments, i.e. lower control arm pivot pins, UCAs, strut rods, etc. need to be assembled LOOSELY. Then drop it own on the ground so full weight is on the suspension. Bounce it a few times. Now get under there and tighten everything up. What happens is if you tighten everything up while the car is up in the air, the bushings all get tightened in their "fully extended" positions, and when you drop it onto the ground, it puts them in a bind; then when driving the car the suspension compresses even more when hitting bumps and road irregularities, increasing the bind. This is especially true with rubber components. It can load the bushings beyond their designed limits.
So, loosen everything up (not sloppy-loose, just not tight), get the weight on the front end and tighten everything up. Lube everything up while you're under there.
BTW, poly bushings usually come with a packet of "poly-friendly" grease to use during assembly, MOST are not installed dry- but I don't know which ones you used.
