HELP, rear end sagging bad trying to get ready for drag week

From the looks of the gaps between the leaves, I am wagering that more than one leaf is split in two at the center bolt hole. Pretty well done what they were intended to do and then some...

Yes agree that the lower short leaf is split in 2 at the center bolt. I blew up the photo of the Driver's side leaf, looks like there is a faint up and down crack on that lower leaf between the U Bolts.

Same thing happened to this 67 Dart, both sides that short leaf was split in half. Put the so called Big Block lower short leaf in the stack (3/8" thick). It gave the car a 2" Lift and still rides nice, not too stiff like the new Super Stock Springs can be.

You can see the new Thicker Short Leaf in the stack on the bottom, here on this 67 Dart.

67DartBigLeaf.jpg