only thing I didn't see was lca relocation brackets, you weld em to the bottom of the rear end and it drops the back of your lca's 3 inches for better traction...I'm sure you know that, but if you don't have em and your car is lowered then I can see why you have poor traction. I put some on my 89 and the difference is amazing.
LMperformance.com part no. 001478

 

They are on there Weasel, did just forget to add them in, it was late last nite . Good catch though, you know your f-bods i see

 

11.5 on that cummins...nice