The front springs should have a little bit of droop when the car's at ride height ready to race. If the springs are loose when you have the car up in the air then you have to check things out a little.

All of the springs will take a set after a few runs. I normally re-shim the springs so that I get the same droop on both sides and it's fine (shim under the spring at the e-clip). If you have to add more than .030" of shims to get the droop correct with 20 front springs they're probably collapsed from a crash and should be replaced.