i agree with stu too much arch in the springs ,probably real stiff. the susp will not wrap up enough to even have the traction bar toutch the spring.
the lowering block will only amplify the hop problem.
thay wont help much like they are now.
you could modify or shim the rear mount to bring them closer to the spring and see how that helps or dearch the spring get rid of the lowering blocks as it will be lower and then see how things line up.