s/s springs & front sus?

Do you have any pictures of the car upon launch or maybe some video so we can see exactly what its doing? You said you checked to see if the shocks are reaching full extension did you do that by jacking up the body disconnecting the shocks and letting the rear hang? If so the SS springs on my car bow a lot more under load so a longer than stock shock is a must. What direction are your rear shackles facing when the car is at rest? Have you tried aftermarket clamps on the front half of the spring? When you stage are you taking all of the slack out of the suspension before you launch negating the "shock" style suspension? Try a home made spacer on the front shock giving you another inch or so of travel and see what effect it has? Hope this helps:)