[LS short box]

On all my LS swaps I didn't measure the clearance between the rocker and the valve spring. IIRC I just made sure the cam was on the base circle and torqued the rocker arms down to 22 foot pounds one by one.. Double check that foot pound number. Why would you have .005 clearance when the rocker is torqued properly?
As said above very odd you only have 30 pounds in one cylinder.