Ss spring tuning

I have the same springs shocks and tires as you but I have a 904 with a 418 stroker my car hooks real good and goes straight but about 30ft out the springs seem to unload and my wheels start hopping have any ideas to a cure ?
I wonder if it's not maintaining the weight transfer from the hit and as the car settles down there's not enough weight to keep the tires planted. Might be either too stiff of a spring or maybe too stiff of a shock setting on the rear?