Qs about Suspension, Torsion, and other French Words...

I didn't like the sagging rear end of my truck, so I decided to even things out the cheapest and newbiest way I could think of: cranking the front torsion bars and actually lowering the front end until it was even with the rear. :D

Now, the truck looks great, but I've noticed that it feels like it's got no give at all in the suspension. I mean, when I hit even small parking lot speed bumps, it's like BAM and the CD player skips and everything. Am I harming the truck? Should I crank the front back up again? Is there anything I can crank up in the back? Any other (hopefully cheap)(cheaper) suggestions for the age-old problem of the sagging rear?

Ted
'94 4Runner 3VZE 5-Speed
'91 Camry 3VZFE Automatic