Rough ride after installing springs

370zFORme!!

So this weekend I removed eibach springs and installed H&R springs. After the install, my test drive proved to be a pretty rough ride. When I go over small bumps or drive over a small divet in the road, there is a really loud noise. Not like a clunking sound but more of a thud. Not only that but the rear end feels like it is not as stable as before. I triple checked all bolts and torque wrenched everything. My question is, could I have blown a seal in the front struts or something similar? I can tell my alignment is off because of the instability of the rear end. I tried to take it to an alignment shop to see my alignment specs and they couldn't even get it on their lift cuz it's so low. Where locally could I take it to have them inspect my work and do an alignment for not a lot of money? Please don't say stillen. They quoted me $250 to inspect, $200 for rear camber arms install and $125 for alignment. So ridiculous. Thanks for the responses!

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87' Honda Civic Hatchback: Kaput @ 288,000 miles, 90' Toyota Celica: Kaput @ 175,000 miles, 93' Mitsubishi 3000GT VR4: Kaput @ 138,000 miles, 06' Scion Tc: Traded in @ 64,000 miles, 10' Nissan 370z: Traded in @ 25,000 miles, 12' Subaru Impreza Sti: Current.