suspension, wtf!?

[dabouncerx24]

About 12,000 miles ago, when I first got my Integra, I switched out the stock suspension for some new Tokico shocks and springs (non-adjustable, 1.25 - 1.5" drop). In terms of mileage for these things, my set is actually fairly new. Plus the fact that I don't do crazy driving to stress out the suspension. These springs barely gives a drop, and feels almost stock so my back won't have to pay the price, which was exactly what I was striving for.

On sunday, I hauled my friends and myself back to Davis from SF. Those two together was about 300 pounds. The luggage in the trunk added up to be another 60-70 pounds or so. In the front was my GF and I, about another 300 pounds). The whole way up, the rear tires kept scratching the under side of the chassis. I just checked it, and the thread-like covering has been scratched away on both sides, and I can see the metal frame (talking about the body, not the tires).

Right before all that shit happened, a new Skunk2 camber kit was installed and my wheels were aligned. My questions are, what kind of damage would this problem cause? Would this mis-align the wheels again? Do I need new rear springs. These springs came with a very little drop, and I never abused them, even on bumps and holes I go slower to ease the impact. And no, I never let other ppl drive it. Tokico is known to make quality suspension for the everyday driver. What exactly is the problem?

EDIT: and I've hauled around even more weight a couple of times before this, and it never happened.